Zhao, Xiaohan, and Yanbin Chen. “Spatial Agglomeration and Diffusion of Population Based on a Regional Density Function Approach: A Case Study of Shandong Province in China”. Journal of Geographical Research 6, no. 3 (July 31, 2023): 61–80. Accessed November 24, 2024. https://journals.bilpubgroup.com/index.php/jgr/article/view/5826.