6Hoover, E. M. The Measurement of Industrial Localization[J]. Review of Economics and Statistics, 1936 (18), 162-171.
7Krugman Paul. Increasing Returns and Economic Geography [ J ]. Journal of Political Economics, 1991 (99), 483-499.
8Ellison G. and E. L. Glaeser. Geographic Concentration in U. S. Manufacturing Industries: A Dartboard Approach[J ], Journal of Political Economics, 1997 (105), 899-927.
9Duranton, G., and H. G., Overman. Testing for Localization Using Micro-Geographic Data[J]. Review of Economic Studies, 2005 (72), 1077-1106.
10Ellison G. and E. L., Glaeser. Geographic Concentration of Industry: Does Natural Advantage Explain Agglomeration? [ J ]. American Economic Review, 1999 (89), 311-316.