5Helpman, E. , Krugman, P. R. Market Structure and Foreign Trade : Increasing Returns, Imperfect Competition and the International Economy [ M ]. Cambridge, Massachusetts : MIT Press, 1985.
6Krugman, P. R. Geography and Trade[ M]. Cambridge, Massachusetts: MIT press, 1991.
7Porter, M. E. Towards a Dynamic Theory of Strategy[J]. Strategic Management Journal, 1991, 12(2) :95-117.
8陈泽星.中国贸易业绩指数(1996-2000)[M].北京:对外经济贸易大学出版社,2004.
9Levins, R. Evolution in Changing Environments[ M]. Princeton: Princeton University Press, 1968.
10Pianka, E.R. The Structure of Lizard Communities[J]. Annual Review of Ecology and Systematics, 1973, (4):53 -74.