4GIULIANO G, SMALL K A.Sub-centers in the Los Angeles region [J]. Regional Science and Urban Economics, 1991, 21 (2): 163-182.
5MCMILLEN D P, MCDONALD J F. Population density in suburban Chicago: abid-rent approach[J]. Urban Studies, 1998, 55(7): 1119-1130.
6BERTAUD A. The spatial organization of cities: deliberate outcome or unfores een consequence[R]? Berkeley Institute of Urban and Regional Development university of California, 2004.
7HALL P, PAIN K. The polycentric metropolis learning from mega-city regions in Europe[M]. Londorr Earthscan, 2006: 1- 16.