1 Center for Population and Development Studies, Renmin University of China, Beijing 100872; 2 Center for Population and Development Studies, Renmin University of China, Beijing 100872
Published:2005-01-29
Online:2005-01-29
About Author:1 Professor,Center for Population and Development Studies, Renmin University of China; 2 PhD,Center for Population and Development Studies, Renmin University of China