%0 Journal Article %A Gu Chaolin %T A PRELIMINARY STUDY ON THE DIVISION OF URBAN ECONOMIC REGIONS IN CHINA %D 1991 %R 10.11821/xb199102001 %J Acta Geographica Sinica %P 129-141 %V 46 %N 2 %X If a nodel point exist in a nodal region,, there is a link figure through two or more delta-shaped regions. %U https://www.geog.com.cn/EN/10.11821/xb199102001