4[3]Nicholas Economides: The Economics of Networks, International Journal of Industrial Organization, September 1995.
5[4]De Bijl,Paul W. J. and Goyal: Technological Change in Markets with Network Externalities, International Journal of Industrial Organization, October 1995.
6[5]Michael Katz, Carl Shapiro: Network Externalities,Competition, and Compatibility, American Economic Review,June 1985.
7[1]Farrell.J and G.Saloner:Standardization and Variety,Economics Letters[J],1986,vol.20.