Zhao, Miaoxi, Ben Derudder, and Junhao Huang. “Polycentric Development in China’s Mega-City Regions, 2001-08: A Comparison of the Yangtze and Pearl River Deltas”. DIE ERDE – Journal of the Geographical Society of Berlin 148, no. 1 (March 31, 2017): 1-13. Accessed February 1, 2023. https://www.die-erde.org/index.php/die-erde/article/view/280.