7Fujita, M. and P. Krugman. When is the Economy Monocentric?von Thunen and Chamberlin Unified, Regional Science and Urban Economics, 1995 (25) :505 - 528.
8Mills, E.and Hamilton, B. Urban Economics. Glencoe,Ⅲ:Scott - Freeman, 1984.
9Yang, X. Development, Structure Change, and Urbanization.Journal of Development Economics, 1991 (34) : 199 - 222.
10Yang, X. and Rice, R. An Equilibrium Model Endogenizing the Emergence of a Dual Structure between the Urban and Rural Sectors. Journal of Urban Economics, 1994(25 ) :346 - 68.
