1. Allen D (1988) New Telecommunications Services: Network Externalities and Critical Mass. Telecommunications Policy, September, pp 257–271
2. Allen D (1990) Break-up of the American Telephone Company: the Intellectual Conflict Before and Since, paper presented at the 8th International Conference of the International Telecommunications Society, on “Telecommunications and the Challenge of Innovation and Global Competition”, held in Venice, 18–21 March
3. Amiel M, Rochet J (1987) Concurrence entre Réseaux de Télécommunications: les Conséquences des Externalités Négatives. Ann Télécomm 42 (11/12):642–649
4. Antonelli C (1991) The International Diffusion of Advanced Telecommunications: Opportunities for Developing Countries. OECD Publication
5. Blankart C, Knieps G (1992) The Critical Mass Problem in a Dynamic World: Theory and Applications to Telecommunication. In: Klaver F, Slaa P (eds) Telecommunications: New Signposts to Old Roads. IOS Press, Amsterdam, pp 55–63