4Geroski P Entry, Innovation and Productivity Growth [J]. Review of Economics and Statistics, 1989, 71 : 572 -578.
5Gort M, Klepper S. Time Paths in the Diffusion of Product Innovations [ J ]. Economic Journal, 1982, 92: 630- 653.
6Lyda S Bigelow, et al. Legitimation, Geographical Scale, and Organizational Density: Regional Patterns of Foundings of American Automobile Producers, 1885 - 1981 [J]. Social Science Research, 1997, 26:377-398.
7Olav Sorenson. The Effect of Population - Level Learning on Market Entry: the American Automobile Industry [J]. Social Scienc Research, 2000, 29:307-326.