Comparing hillside urbanizations of Beijing-Tianjin-Hebei, Yangtze River Delta and Guangdong-Hong Kong-Macau greater Bay area urban agglomerations in China. - Chao Yang 010; Rongling Xia; Qingquan Li; Huizeng Liu; Tiezhu Shi; Guofeng Wu (Int. J. Appl. Earth Obs. Geoinformation, 2021)