IDEAS home Printed from https://ideas.repec.org/a/eee/trapol/v136y2023icp83-97.html
   My bibliography  Save this article

Business model hybridization but heterogeneous economic performance: Insights from low-cost and legacy carriers in Europe

Author

Listed:
  • Chiambaretto, Paul
  • Combe, Emmanuel

Abstract

Over the last decade, low-cost and legacy carriers have evolved their respective business models, leading to business model “hybridization”. However, the economic performance impacts of such convergence remain underinvestigated. We therefore evaluate whether airline business model hybridization has led to homogeneous economic performance in Europe. Using 2019 data for 25 European airlines, we implement hierarchical clustering based on principal components. We show that regardless of the analysis level (i.e., the number of clusters into which we group airlines), low-cost and legacy carriers remain distinct groups with specific economic performance characteristics (e.g., volume, revenue, cost and profitability). That is, despite increasing hybridization, the economic performance of airline business models is not homogeneous; overall, low-cost carriers remain more profitable (with lower costs and more affordable fares) than legacy carriers.

Suggested Citation

  • Chiambaretto, Paul & Combe, Emmanuel, 2023. "Business model hybridization but heterogeneous economic performance: Insights from low-cost and legacy carriers in Europe," Transport Policy, Elsevier, vol. 136(C), pages 83-97.
  • Handle: RePEc:eee:trapol:v:136:y:2023:i:c:p:83-97
    DOI: 10.1016/j.tranpol.2023.03.016
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0967070X23000756
    Download Restriction: Full text for ScienceDirect subscribers only

    File URL: https://libkey.io/10.1016/j.tranpol.2023.03.016?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    References listed on IDEAS

    as
    1. Klophaus, Richard & Merkert, Rico & Lordan, Oriol, 2021. "Mesh network as a competitive advantage for European LCCs: An alternative topology to hub-and-spoke for selling online connections," Transport Policy, Elsevier, vol. 106(C), pages 196-204.
    2. Moir, Loren & Lohmann, Gui, 2018. "A quantitative means of comparing competitive advantage among airlines with heterogeneous business models: Analysis of U.S. airlines," Journal of Air Transport Management, Elsevier, vol. 69(C), pages 72-82.
    3. Frédéric Dobruszkes & Moshe Givoni & Timothy Vowles, 2017. "Hello major airports, goodbye regional airports? Recent changes in European and US low-cost airline airport choice," ULB Institutional Repository 2013/239911, ULB -- Universite Libre de Bruxelles.
    4. Corbo, Leonardo, 2017. "In search of business model configurations that work: Lessons from the hybridization of Air Berlin and JetBlue," Journal of Air Transport Management, Elsevier, vol. 64(PB), pages 139-150.
    5. Escobar-Rodríguez, T. & Carvajal-Trujillo, E., 2014. "Online purchasing tickets for low cost carriers: An application of the unified theory of acceptance and use of technology (UTAUT) model," Tourism Management, Elsevier, vol. 43(C), pages 70-88.
    6. de Wit, Jaap G. & Zuidberg, Joost, 2016. "Route churn: an analysis of low-cost carrier route continuity in Europe," Journal of Transport Geography, Elsevier, vol. 50(C), pages 57-67.
    7. Roucolle, Chantal & Seregina, Tatiana & Urdanoz, Miguel, 2020. "Measuring the development of airline networks: Comprehensive indicators," Transportation Research Part A: Policy and Practice, Elsevier, vol. 133(C), pages 303-324.
    8. Jones, Owain Cai & Budd, Lucy C.S. & Pitfield, D.E., 2013. "Aeronautical charging policy incentive schemes for airlines at European airports," Journal of Air Transport Management, Elsevier, vol. 33(C), pages 43-59.
    9. Kangis, Peter & O'Reilly, M. Dolores, 2003. "Strategies in a dynamic marketplace: A case study in the airline industry," Journal of Business Research, Elsevier, vol. 56(2), pages 105-111, February.
    10. Zuidberg, Joost & de Wit, Jaap G., 2020. "The development of long-haul low-cost networks in the North Atlantic airline market: An exploratory data approach," Transport Policy, Elsevier, vol. 95(C), pages 103-113.
    11. Aghaie, Sina & Javadinia, Amir & Mirahmad, Hooman & Janani, Saeed, 2022. "How incumbents’ response strategy impacts rivals’ market exit timing?," Journal of Business Research, Elsevier, vol. 146(C), pages 251-263.
    12. Sarkis, Joseph & Talluri, Srinivas, 2004. "Performance based clustering for benchmarking of US airports," Transportation Research Part A: Policy and Practice, Elsevier, vol. 38(5), pages 329-346, June.
    13. Lohmann, Gui & Koo, Tay T.R., 2013. "The airline business model spectrum," Journal of Air Transport Management, Elsevier, vol. 31(C), pages 7-9.
    14. Severin Borenstein, 2011. "Why Can't US Airlines Make Money?," American Economic Review, American Economic Association, vol. 101(3), pages 233-237, May.
    15. Keiningham, Timothy & Aksoy, Lerzan & Bruce, Helen L. & Cadet, Fabienne & Clennell, Natasha & Hodgkinson, Ian R. & Kearney, Treasa, 2020. "Customer experience driven business model innovation," Journal of Business Research, Elsevier, vol. 116(C), pages 431-440.
    16. M. Argüelles & C. Benavides & I. Fernᮤez, 2014. "A new approach to the identification of regional clusters: hierarchical clustering on principal components," Applied Economics, Taylor & Francis Journals, vol. 46(21), pages 2511-2519, July.
    17. Soyk, Christian & Ringbeck, Jürgen & Spinler, Stefan, 2017. "Long-haul low cost airlines: Characteristics of the business model and sustainability of its cost advantages," Transportation Research Part A: Policy and Practice, Elsevier, vol. 106(C), pages 215-234.
    18. Fuellhart, Kurt & Dai, Liang & Grubesic, Tony & Derudder, Ben, 2021. "The U.S. Essential Air Service Program and SARS C0V-2, 2019–2020," Journal of Transport Geography, Elsevier, vol. 96(C).
    19. Lu, Jin-Long, 2017. "Segmentation of passengers using full-service and low-cost carriers – Evidence from Taiwan," Journal of Air Transport Management, Elsevier, vol. 62(C), pages 204-216.
    20. Paul Chiambaretto & Anne-Sophie Fernandez, 2014. "Transferring low-cost marketing practices from air to rail services: The Ouigo case," Post-Print hal-02050258, HAL.
    21. Klophaus, Richard & Conrady, Roland & Fichert, Frank, 2012. "Low cost carriers going hybrid: Evidence from Europe," Journal of Air Transport Management, Elsevier, vol. 23(C), pages 54-58.
    22. Tongzon, Jose & Heng, Wu, 2005. "Port privatization, efficiency and competitiveness: Some empirical evidence from container ports (terminals)," Transportation Research Part A: Policy and Practice, Elsevier, vol. 39(5), pages 405-424, June.
    23. Tapiador, Francisco J. & Burckhart, Kerstin & Martí-Henneberg, Jordi, 2009. "Characterizing European high speed train stations using intermodal time and entropy metrics," Transportation Research Part A: Policy and Practice, Elsevier, vol. 43(2), pages 197-208, February.
    24. de Wit, Jaap G. & Zuidberg, Joost, 2012. "The growth limits of the low cost carrier model," Journal of Air Transport Management, Elsevier, vol. 21(C), pages 17-23.
    25. Marie Delaplace & Frédéric Dobruszkes, 2015. "From low-cost airlines to low-cost high-speed rail? The French case," ULB Institutional Repository 2013/186381, ULB -- Universite Libre de Bruxelles.
    26. Richardson, Charles & Budd, Lucy & Pitfield, David E., 2014. "A hierarchical cluster analysis of the financial performance of US hub airports in relation to lease agreement types," Journal of Airport Management, Henry Stewart Publications, vol. 8(1), pages 42-56, January.
    27. Boon Liat Lee & Clevo Wilson & Carl A. Pasurka & Hidemichi Fujii & Shunsuke Managi, 2017. "Sources of airline productivity from carbon emissions: an analysis of operational performance under good and bad outputs," Journal of Productivity Analysis, Springer, vol. 47(3), pages 223-246, June.
    28. Calzada, Joan & Fageda, Xavier & Safronov, Roman, 2022. "How do global airline alliances affect flight frequency? Evidence from Russia," Journal of Air Transport Management, Elsevier, vol. 98(C).
    29. Cabral, Alexandra Maria Rios & Ramos, Francisco de Sousa, 2014. "Cluster analysis of the competitiveness of container ports in Brazil," Transportation Research Part A: Policy and Practice, Elsevier, vol. 69(C), pages 423-431.
    30. Windle, Robert & Dresner, Martin, 1999. "Competitive responses to low cost carrier entry," Transportation Research Part E: Logistics and Transportation Review, Elsevier, vol. 35(1), pages 59-75, March.
    31. Nava, Consuelo R. & Meleo, Linda & Cassetta, Ernesto & Morelli, Giovanna, 2018. "The impact of the EU-ETS on the aviation sector: Competitive effects of abatement efforts by airlines," Transportation Research Part A: Policy and Practice, Elsevier, vol. 113(C), pages 20-34.
    32. Dobruszkes, Frédéric & Givoni, Moshe & Vowles, Timothy, 2017. "Hello major airports, goodbye regional airports? Recent changes in European and US low-cost airline airport choice," Journal of Air Transport Management, Elsevier, vol. 59(C), pages 50-62.
    33. Fageda, Xavier & Suau-Sanchez, Pere & Mason, Keith J., 2015. "The evolving low-cost business model: Network implications of fare bundling and connecting flights in Europe," Journal of Air Transport Management, Elsevier, vol. 42(C), pages 289-296.
    34. Delaplace, Marie & Dobruszkes, Frédéric, 2015. "From low-cost airlines to low-cost high-speed rail? The French case," Transport Policy, Elsevier, vol. 38(C), pages 73-85.
    35. Fu, Xiaowen & Lei, Zheng & Wang, Kun & Yan, Jia, 2015. "Low cost carrier competition and route entry in an emerging but regulated aviation market – The case of China," Transportation Research Part A: Policy and Practice, Elsevier, vol. 79(C), pages 3-16.
    36. Renan P. de Oliveira & Alessandro V. M. Oliveira & Gui Lohmann, 2021. "A Network-Design Analysis of Airline Business Model Adaptation in the Face of Competition and Consolidation," Transportation Science, INFORMS, vol. 55(2), pages 532-548, March.
    37. Azadian, Farshid & Vasigh, Bijan, 2019. "The blurring lines between full-service network carriers and low-cost carriers: A financial perspective on business model convergence," Transport Policy, Elsevier, vol. 75(C), pages 19-26.
    38. S. Trevis Certo & Richard H. Lester & Catherine M. Dalton & Dan R. Dalton, 2006. "Top Management Teams, Strategy and Financial Performance: A Meta‐Analytic Examination," Journal of Management Studies, Wiley Blackwell, vol. 43(4), pages 813-839, June.
    39. Daft, Jost & Albers, Sascha, 2015. "An empirical analysis of airline business model convergence," Journal of Air Transport Management, Elsevier, vol. 46(C), pages 3-11.
    40. Adler, Nicole & Golany, Boaz, 2001. "Evaluation of deregulated airline networks using data envelopment analysis combined with principal component analysis with an application to Western Europe," European Journal of Operational Research, Elsevier, vol. 132(2), pages 260-273, July.
    41. Hong, Seock-Jin & Randall, Wesley & Han, Keunsoo & Malhan, Amit Sundeep, 2018. "Estimation viability of dedicated freighter aircraft of combination carriers: A data envelopment and principal component analysis," International Journal of Production Economics, Elsevier, vol. 202(C), pages 12-20.
    42. Pearson, James & Merkert, Rico, 2014. "Airlines-within-airlines: A business model moving East," Journal of Air Transport Management, Elsevier, vol. 38(C), pages 21-26.
    43. Magdalina, Ana & Bouzaima, Martin, 2021. "An empirical investigation of European airline business models: Classification and hybridisation," Journal of Air Transport Management, Elsevier, vol. 93(C).
    44. Chiambaretto, Paul, 2021. "Air passengers’ willingness to pay for ancillary services on long-haul flights," Transportation Research Part E: Logistics and Transportation Review, Elsevier, vol. 147(C).
    45. Nguyen, Minh-Anh Thi & Yu, Ming-Miin & Lirn, Taih-Cherng, 2022. "Revenue efficiency across airline business models: A bootstrap non-convex meta-frontier approach," Transport Policy, Elsevier, vol. 117(C), pages 108-117.
    46. B. Demil & X. Lecocq, 2010. "Business model evolution : in search of dynamic consistency," Post-Print hal-00572915, HAL.
    47. Lin, Ming Hsin, 2012. "Airlines-within-airlines strategies and existence of low-cost carriers," Transportation Research Part E: Logistics and Transportation Review, Elsevier, vol. 48(3), pages 637-651.
    48. Gillen, David & Gados, Alicja, 2008. "Airlines within airlines: Assessing the vulnerabilities of mixing business models," Research in Transportation Economics, Elsevier, vol. 24(1), pages 25-35.
    49. Nikolaou, Paraskevas & Dimitriou, Loukas, 2018. "Evaluation of road safety policies performance across Europe: Results from benchmark analysis for a decade," Transportation Research Part A: Policy and Practice, Elsevier, vol. 116(C), pages 232-246.
    50. repec:eme:aiae11:s2212-160920190000008003 is not listed on IDEAS
    51. Daft, Jost & Albers, Sascha, 2012. "A profitability analysis of low-cost long-haul flight operations," Journal of Air Transport Management, Elsevier, vol. 19(C), pages 49-54.
    52. Detzen, Dominic & Jain, Pankaj K. & Likitapiwat, Tanakorn & Rubin, Rose M., 2012. "The impact of low cost airline entry on competition, network expansion, and stock valuations," Journal of Air Transport Management, Elsevier, vol. 18(1), pages 59-63.
    53. Bettini, Humberto F.A.J. & Silveira, José Maria F.J. & Oliveira, Alessandro V.M., 2018. "Estimating strategic responses to the march of a low cost carrier to primary airports," Transportation Research Part E: Logistics and Transportation Review, Elsevier, vol. 109(C), pages 190-204.
    54. Wen, Chieh-Hua & Chen, Wei-Ying, 2011. "Using multiple correspondence cluster analysis to map the competitive position of airlines," Journal of Air Transport Management, Elsevier, vol. 17(5), pages 302-304.
    55. Tsoukalas, Gerassimos & Belobaba, Peter & Swelbar, William, 2008. "Cost convergence in the US airline industry: An analysis of unit costs 1995–2006," Journal of Air Transport Management, Elsevier, vol. 14(4), pages 179-187.
    56. Pels, Eric & Njegovan, Nenad & Behrens, Christiaan, 2009. "Low-cost airlines and airport competition," Transportation Research Part E: Logistics and Transportation Review, Elsevier, vol. 45(2), pages 335-344, March.
    57. Brons, Martijn & Givoni, Moshe & Rietveld, Piet, 2009. "Access to railway stations and its potential in increasing rail use," Transportation Research Part A: Policy and Practice, Elsevier, vol. 43(2), pages 136-149, February.
    58. Bitzan, John & Peoples, James, 2016. "A comparative analysis of cost change for low-cost, full-service, and other carriers in the US airline industry," Research in Transportation Economics, Elsevier, vol. 56(C), pages 25-41.
    59. Soyk, Christian & Ringbeck, Jürgen & Spinler, Stefan, 2021. "Effect of long-haul low-cost carriers on North Atlantic air fares," Transportation Research Part E: Logistics and Transportation Review, Elsevier, vol. 152(C).
    60. Kos Koklic, Mateja & Kukar-Kinney, Monika & Vegelj, Spela, 2017. "An investigation of customer satisfaction with low-cost and full-service airline companies," Journal of Business Research, Elsevier, vol. 80(C), pages 188-196.
    61. Chiou, Yu-Chiun & Chen, Yen-Heng, 2006. "Route-based performance evaluation of Taiwanese domestic airlines using data envelopment analysis," Transportation Research Part E: Logistics and Transportation Review, Elsevier, vol. 42(2), pages 116-127, March.
    62. Varella, Rafael R. & Frazão, Jessica & Oliveira, Alessandro V.M., 2017. "Dynamic pricing and market segmentation responses to low-cost carrier entry," Transportation Research Part E: Logistics and Transportation Review, Elsevier, vol. 98(C), pages 151-170.
    63. Bachis, Enrico & Piga, Claudio A., 2011. "Low-cost airlines and online price dispersion," International Journal of Industrial Organization, Elsevier, vol. 29(6), pages 655-667.
    64. Paul Chiambaretto, 2021. "Air passengers’ willingness to pay for ancillary services on long-haul flights," Post-Print hal-03514785, HAL.
    65. Soyk, Christian & Ringbeck, Jürgen & Spinler, Stefan, 2018. "Revenue characteristics of long-haul low cost carriers (LCCs) and differences to full-service network carriers (FSNCs)," Transportation Research Part E: Logistics and Transportation Review, Elsevier, vol. 112(C), pages 47-65.
    66. Campbell, Amy R. & Ryley, Tim & Thring, Rob, 2012. "Identifying the early adopters of alternative fuel vehicles: A case study of Birmingham, United Kingdom," Transportation Research Part A: Policy and Practice, Elsevier, vol. 46(8), pages 1318-1327.
    67. Yang, Ann Shawing & Baasandorj, Suvd, 2017. "Exploring CSR and financial performance of full-service and low-cost air carriers," Finance Research Letters, Elsevier, vol. 23(C), pages 291-299.
    68. Graf, Luca, 2005. "Incompatibilities of the low-cost and network carrier business models within the same airline grouping," Journal of Air Transport Management, Elsevier, vol. 11(5), pages 313-327.
    69. Richard Klophaus & Frank Fichert, 2019. "From Low-cost Carriers to Network Carriers without Legacy? Evolving Airline Business Models in Europe," Advances in Airline Economics, in: Airline Economics in Europe, volume 8, pages 57-75, Emerald Group Publishing Limited.
    70. Hunter, Laurie, 2006. "Low Cost Airlines:: Business Model and Employment Relations," European Management Journal, Elsevier, vol. 24(5), pages 315-321, October.
    71. Budd, Lucy & Francis, Graham & Humphreys, Ian & Ison, Stephen, 2014. "Grounded: Characterising the market exit of European low cost airlines," Journal of Air Transport Management, Elsevier, vol. 34(C), pages 78-85.
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Klophaus, Richard & Yu, Chunyan, 2023. "Short-haul airline services in Europe and North America - A cross-business model and cross-continental analysis," Journal of Air Transport Management, Elsevier, vol. 109(C).
    2. Cho, Woohyun & Min, Dong-Jun, 2018. "Longitudinal examination of passenger characteristics among airline types in the US," Journal of Air Transport Management, Elsevier, vol. 72(C), pages 11-19.
    3. Klophaus, Richard & Merkert, Rico & Lordan, Oriol, 2021. "Mesh network as a competitive advantage for European LCCs: An alternative topology to hub-and-spoke for selling online connections," Transport Policy, Elsevier, vol. 106(C), pages 196-204.
    4. Soyk, Christian & Ringbeck, Jürgen & Spinler, Stefan, 2017. "Long-haul low cost airlines: Characteristics of the business model and sustainability of its cost advantages," Transportation Research Part A: Policy and Practice, Elsevier, vol. 106(C), pages 215-234.
    5. Magdalina, Ana & Bouzaima, Martin, 2021. "An empirical investigation of European airline business models: Classification and hybridisation," Journal of Air Transport Management, Elsevier, vol. 93(C).
    6. Renan P. de Oliveira & Alessandro V. M. Oliveira & Gui Lohmann, 2021. "A Network-Design Analysis of Airline Business Model Adaptation in the Face of Competition and Consolidation," Transportation Science, INFORMS, vol. 55(2), pages 532-548, March.
    7. Albers, Sascha & Daft, Jost & Stabenow, Sebastian & Rundshagen, Volker, 2020. "The long-haul low-cost airline business model: A disruptive innovation perspective," Journal of Air Transport Management, Elsevier, vol. 89(C).
    8. Zuidberg, Joost & de Wit, Jaap G., 2020. "The development of long-haul low-cost networks in the North Atlantic airline market: An exploratory data approach," Transport Policy, Elsevier, vol. 95(C), pages 103-113.
    9. Kuljanin, Jovana & Kalić, Milica & Begović, Boris & Mijović, Nemanja & Renold, Manuel, 2021. "The effect of LCC market entry on dominant FSC's price into long haul sector: A case of Norwegian competition on British Airways' prices on selected transatlantic routes," Journal of Air Transport Management, Elsevier, vol. 91(C).
    10. Adiloğlu-Yalçınkaya, Leyla & Besler, Senem, 2021. "Institutional factors influencing business models: The case of Turkish Airlines," Journal of Air Transport Management, Elsevier, vol. 91(C).
    11. Bettini, Humberto F.A.J. & Silveira, José Maria F.J. & Oliveira, Alessandro V.M., 2018. "Estimating strategic responses to the march of a low cost carrier to primary airports," Transportation Research Part E: Logistics and Transportation Review, Elsevier, vol. 109(C), pages 190-204.
    12. Jimenez, Edgar & Suau-Sanchez, Pere, 2020. "Reinterpreting the role of primary and secondary airports in low-cost carrier expansion in Europe," Journal of Transport Geography, Elsevier, vol. 88(C).
    13. Ferrer-Rosell, Berta & Coenders, GermÃ, 2017. "Airline type and tourist expenditure: Are full service and low cost carriers converging or diverging?," Journal of Air Transport Management, Elsevier, vol. 63(C), pages 119-125.
    14. Bernardo, Valeria & Fageda, Xavier, 2020. "Impacts of competition on connecting travelers: Evidence from the transatlantic aviation market," Transport Policy, Elsevier, vol. 96(C), pages 141-151.
    15. Zuidberg, Joost, 2019. "Network geographies and financial performances in low-cost carrier versus network carrier competition: The case of Norwegian versus SAS," Journal of Transport Geography, Elsevier, vol. 79(C), pages 1-1.
    16. Oliveira, Bruno F. & Oliveira, Alessandro V.M., 2022. "An empirical analysis of the determinants of network construction for Azul Airlines," Journal of Air Transport Management, Elsevier, vol. 101(C).
    17. Dziedzic, Marcin & Njoya, Eric T. & Warnock-Smith, David & Hubbard, Nick, 2020. "Determinants of air traffic volumes and structure at small European airports," Research in Transportation Economics, Elsevier, vol. 79(C).
    18. Wang, Yixiao & Sun, Luoyi & Teunter, Ruud H. & Wu, Jianhong & Hua, Guowei, 2020. "Effects of introducing low-cost high-speed rail on air-rail competition: Modelling and numerical analysis for Paris-Marseille," Transport Policy, Elsevier, vol. 99(C), pages 145-162.
    19. Azadian, Farshid & Vasigh, Bijan, 2019. "The blurring lines between full-service network carriers and low-cost carriers: A financial perspective on business model convergence," Transport Policy, Elsevier, vol. 75(C), pages 19-26.
    20. Su, Min & Luan, Weixin & Fu, Xiaowen & Yang, Zaili & Zhang, Rui, 2020. "The competition effects of low-cost carriers and high-speed rail on the Chinese aviation market," Transport Policy, Elsevier, vol. 95(C), pages 37-46.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:trapol:v:136:y:2023:i:c:p:83-97. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Catherine Liu (email available below). General contact details of provider: http://www.elsevier.com/wps/find/journaldescription.cws_home/30473/description#description .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.