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2. Motta, Massimo, 1993. "Endogenous Quality Choice: Price vs. Quantity Competition," Journal of Industrial Economics, Blackwell Publishing, vol. 41(2), pages 113-31, June. [Downloadable!] (restricted)
3. Motta, Massimo, 1992. "Cooperative R&D and vertical product differentiation," International Journal of Industrial Organization, Elsevier, vol. 10(4), pages 643-661, December. [Downloadable!] (restricted)
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   • Motta, M., 1991. "Cooperative R & D and vertical product differentiation," Papers 9128, Catholique de Louvain - Center for Operations Research and Economics.
4. Suzanne Scotchmer & Jerry Green, 1990. "Novelty and Disclosure in Patent Law," RAND Journal of Economics, The RAND Corporation, vol. 21(1), pages 131-146, Spring. [Downloadable!] (restricted)
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   • Scotchmer, S. & Green, J., 1988. "Novelty And Disclosure In Patent Law," Papers e-89-2, Stanford - Hoover Institution.
5. Ulrich Lehmann-Grube, 1997. "Strategic Choice of Quality When Quality is Costly: The Persistence of the High-Quality Advantage," RAND Journal of Economics, The RAND Corporation, vol. 28(2), pages 372-384, Summer. [Downloadable!] (restricted)
6. Jerry R. Green & Suzanne Scotchmer, 1995. "On the Division of Profit in Sequential Innovation," RAND Journal of Economics, The RAND Corporation, vol. 26(1), pages 20-33, Spring. [Downloadable!] (restricted)
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   • Green, J.R. & Scotchmer, S., 1993. "On the Division of Profit in Sequential Innovation," Harvard Institute of Economic Research Working Papers 1638, Harvard - Institute of Economic Research.
7. Mansfield, Edwin & Schwartz, Mark & Wagner, Samuel, 1981. "Imitation Costs and Patents: An Empirical Study," Economic Journal, Royal Economic Society, vol. 91(364), pages 907-18, December. [Downloadable!] (restricted)
8. Choi, Chong Ju & Shin, Hyun Song, 1992. "A Comment on a Model of Vertical Product Differentiation," Journal of Industrial Economics, Blackwell Publishing, vol. 40(2), pages 229-31, June. [Downloadable!] (restricted)
9. James Cardon & Dan Sasaki, 1998. "Preemptive Search and R&D Clustering," RAND Journal of Economics, The RAND Corporation, vol. 29(2), pages 324-338, Summer. [Downloadable!] (restricted)
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   • James H. Cardon & Dan Sasaki, 1996. "Pre-emptive Search and R&D Clustering," Discussion Papers 96-21, University of Copenhagen. Department of Economics.
10. Richard C. Levin & Alvin K. Klevorick & Richard R. Nelson & Sidney G. Winter, 1987. "Appropriating the Returns from Industrial Research and Development," Brookings Papers on Economic Activity, Economic Studies Program, The Brookings Institution, vol. 18(1987-3), pages 783-832. [Downloadable!]
11. L. Colombo & L. Lambertini, 2002. "Dynamic Advertising under Vertical Product Differentiation," Working Papers 456, Dipartimento Scienze Economiche, Università di Bologna. [Downloadable!]
12. Richard Gilbert & Carl Shapiro, 1990. "Optimal Patent Length and Breadth," RAND Journal of Economics, The RAND Corporation, vol. 21(1), pages 106-112, Spring. [Downloadable!] (restricted)
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    • Richard Gilbert and Carl Shapiro., 1989. "Optimal Patent Length and Breadth," Economics Working Papers 89-102, University of California at Berkeley.
    • Gilbert, R. & Shapiro, C., 1988. "Optimal Patent Length And Breadth," Papers 28, Princeton, Woodrow Wilson School - Discussion Paper.
13. Rosenkranz, Stephanie, 1995. "Innovation and cooperation under vertical product differentiation," International Journal of Industrial Organization, Elsevier, vol. 13(1), pages 1-22, March. [Downloadable!] (restricted)
14. Shabtai Donnenfeld & Shlomo Weber, 1995. "Limit Qualities and Entry Deterrence," RAND Journal of Economics, The RAND Corporation, vol. 26(1), pages 113-130, Spring. [Downloadable!] (restricted)
    Other versions:
    • Donnenfeld, S. & Weber, S., 1991. "Limit Qualities and Entry Deterrence," Papers 92-4, York (Canada) - Department of Economics.
15. Richard C. Levin & Alvin K. Klevorick & Richard R. Nelson & Sidney G. Winter, 1988. "Appropriating the Returns from Industrial R&D," Cowles Foundation Discussion Papers 862, Cowles Foundation, Yale University. [Downloadable!]
16. James Bessen & Eric Maskin, 2006. "Sequential Innovation, Patents, and Imitation," Economics Working Papers 0025, Institute for Advanced Study, School of Social Science. [Downloadable!]
17. Ted O'Donoghue & Suzanne Scotchmer & Jacques-François Thisse, 1998. "Patent Breadth, Patent Life, and the Pace of Technological Progress," Journal of Economics & Management Strategy, Blackwell Publishing, vol. 7(1), pages 1-32, 03. [Downloadable!] (restricted)
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    • Paul Klemperer, 1990. "How Broad Should the Scope of Patent Protection Be?," RAND Journal of Economics, The RAND Corporation, vol. 21(1), pages 113-130, Spring. [Downloadable!] (restricted)
19. Aoki, Reiko & Prusa, Thomas J., 1997. "Sequential versus simultaneous choice with endogenous quality," International Journal of Industrial Organization, Elsevier, vol. 15(1), pages 103-121, February. [Downloadable!] (restricted)
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21. Dutta, Prajit K & Lach, Saul & Rustichini, Aldo, 1995. "Better Late Than Early: Vertical Differentiation in the Adoption of a New Technology," Journal of Economics & Management Strategy, Blackwell Publishing, vol. 4(4), pages 563-89, Winter.
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    • Prajit K. Dutta & Saul Lach & Aldo Rustichini, 1993. "Better Late Than Early: Vertical Differentiation in the Adoption of a New Technology," NBER Working Papers 4473, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
22. Jaskold Gabszewicz, J. & Thisse, J. -F., 1979. "Price competition, quality and income disparities," Journal of Economic Theory, Elsevier, vol. 20(3), pages 340-359, June. [Downloadable!] (restricted)
23. Ted O'Donoghue, 1998. "A Patentability Requirement for Sequential Innovation," RAND Journal of Economics, The RAND Corporation, vol. 29(4), pages 654-679, Winter. [Downloadable!] (restricted)
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25. Rosenkranz, Stephanie, 1997. "Quality improvements and the incentive to leapfrog," International Journal of Industrial Organization, Elsevier, vol. 15(2), pages 243-261, April. [Downloadable!] (restricted)
26. Scotchmer, Suzanne, 1991. "Standing on the Shoulders of Giants: Cumulative Research and the Patent Law," Journal of Economic Perspectives, American Economic Association, vol. 5(1), pages 29-41, Winter. [Downloadable!] (restricted)
27. Beath, John & Katsoulacos, Yannis & Ulph, David, 1987. "Sequential Product Innovation and Industry Evolution," Economic Journal, Royal Economic Society, vol. 97(388a), pages 32-43, Supplemen. [Downloadable!] (restricted)
28. Shaked, Avner & Sutton, John, 1983. "Natural Oligopolies," Econometrica, Econometric Society, vol. 51(5), pages 1469-83, September. [Downloadable!] (restricted)
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30. Lambertini, Luca, 1999. "Endogenous timing and the choice of quality in a vertically differentiated duopoly," Research in Economics, Elsevier, vol. 53(1), pages 101-109, March. [Downloadable!] (restricted)
31. Donnenfeld, Shabtai & Weber, Shlomo, 1992. "Vertical product differentiation with entry," International Journal of Industrial Organization, Elsevier, vol. 10(3), pages 449-472, September. [Downloadable!] (restricted)

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1. E. Bacchiega & L. Lambertini & A. Mantovani, 2007. "Process and product innovation in a vertically differentiated industry," Working Papers 583, Dipartimento Scienze Economiche, Università di Bologna. [Downloadable!]