PORTER M. How competitive forces shape strategy [J]. Harvard Business Review, 1979, 57(2): 137-145.
[2]
TIROLE J. The theory of industrial organization[M]. Beijing: Renmin University of China Press, 1997. 281-285(in Chinese). [泰勒尔. 产业组织理论[M]. 北京:人民大学出版社,1997. 281-285.]