1. Jaskold Gabszewicz, J. & Thisse, J. -F., 1980. "Entry (and exit) in a differentiated industry," Journal of Economic Theory, Elsevier, vol. 22(2), pages 327-338, April. [Downloadable!] (restricted)
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. 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)
   Other versions:
   • Scotchmer, S. & Green, J., 1988. "Novelty And Disclosure In Patent Law," Papers e-89-2, Stanford - Hoover Institution.
4. 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)
   Other versions:
   • 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.
5. 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)
6. 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)
   Other versions:
   • 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.
7. 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)
8. 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)
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   • Donnenfeld, S. & Weber, S., 1991. "Limit Qualities and Entry Deterrence," Papers 92-4, York (Canada) - Department of Economics.
9. James Bessen & Eric Maskin, 2006. "Sequential Innovation, Patents, and Imitation," Economics Working Papers 0025, Institute for Advanced Study, School of Social Science. [Downloadable!]
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   • James Bessen & Eric Maskin, 2009. "Sequential innovation, patents, and imitation," RAND Journal of Economics, RAND Corporation, vol. 40(4), pages 611-635. [Downloadable!] (restricted)
10. Klemperer, Paul, 1990. "How Broad Should the Scope of Patent Protection Be?," CEPR Discussion Papers 392, C.E.P.R. Discussion Papers. [Downloadable!] (restricted)
    Other versions:
    • 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)
11. 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)
12. Nancy T. Gallini, 1992. "Patent Policy and Costly Imitation," RAND Journal of Economics, The RAND Corporation, vol. 23(1), pages 52-63, Spring. [Downloadable!] (restricted)
13. 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.
    Other versions:
    • 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)
14. 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)
15. Shaked, Avner & Sutton, John, 1982. "Relaxing Price Competition through Product Differentiation," Review of Economic Studies, Blackwell Publishing, vol. 49(1), pages 3-13, January. [Downloadable!] (restricted)
16. 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)
17. 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)
18. 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)
19. Shaked, Avner & Sutton, John, 1983. "Natural Oligopolies," Econometrica, Econometric Society, vol. 51(5), pages 1469-83, September. [Downloadable!] (restricted)
20. 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)
21. 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, Universita' di Bologna. [Downloadable!]