Shuxing, Chen, and Ding Renzhong. “Urban Shrinkage and the Identification of China’s Shrinking Cities. A Study Based on Semi-Industrialized Semi-Urbanized Structure”. Problemy Ekorozwoju, vol. 13, no. 1, Jan. 2018, pp. 185-9, https://ph.pollub.pl/index.php/preko/article/view/5051.