7Lucas. R. E. Externalities and Cities [ J ]. Re- view of Economic Dynamics,2001,4(2 ) : 117 - 129.
8Black. D. and Henderson. V.J. A Theory of Ur- ban Growth [ J ]. Journal of Political Economy, 1999,107 (2).
9Jones. C., and Romer, P. The New Kaldor Facts : Ideas, Institutions, Population, and Human Capital [ J]. American Economic Journal. Macroeconomics,2010, 2(1).
10Bruhart andMathys. Sectoral Agglomeration E- conomies in a Panel of European Regions, Regional Science and Urban Economics ,2008,38 : 348 - 362.
