4Haunschild, P R. Interorganizational Imitation: the Impact of Interlocks on Corporate Acquisition Activity[J]. Administrative Science Quarterly. 38:546-592,1993.
5Banerjee,A V. A Simple Model of Herd Behavior[J]. Quarterly Journal of Economics. 107:797-817,1992.
6Chin J , and Grossman. Intellectual Property Rights and North-South Trade[J]. National Byreau of Economic Research Working Paper Series, No.2769, November, 1991.