中国人口疏密区分界线的历史变迁及数学拟合与地理意义
龚胜生,陈云

The historical change, mathematical fitting and geographical significance of demographic borderlines in China
GONG Shengsheng,CHEN Yun
图2 中国两千年来人口稀疏区与稠密区的演变
Fig. 2 The evolution of the sparse and dense areas of China's population since the past 2000 years ago