6Steven S Liu, Hang- yue Ngo. An action Pattem Model of Interfirm Cooperation. Journal of Management Studies, 2005 (9) : 1123 - 1153.
7Freeman. Networks of Innovators: A synthesis of Research Issues. Research Policy, 1991(5) :499 - 514.
8Besen, Stanley M, Fan'ell, Joseph. Choosing how to compete: Strategies and tactics in standardization. Journal of Economic Perspectives, Spring94, Vol. 8 Issue 2:117 - 131.