文献：Geographic Concentration in U.S. Manufacturing Industries: A Dartboard Approach
作者：Glenn Ellison and Edward L. Glaeser
期刊：The Journal of Political Economy,
页码及卷号：Vol. 105, No. 5 (Oct., 1997), pp. 889-927 
电子链接：http://links.jstor.org/sici?sici=0022-3808(199710)105:5%3C889:GCIUMI%3E2.0.CO;2-5

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