1. Increasing returns to scale and network externalities;Chou,1988
2. Market share rivalry with compatibility but without network externalities;Chien-fu,1989
3. Monopolistic competition and optimum product diversity;Dixit;American Economic Review,1977
4. Standardization, compatibility, and innovation;Farrell;Rand Journal of Economics,1985
5. Network externalities, competition, and compatibility;Katz;American Economic Review,1985