Research on comprehensive assessment of ecological security in Hebei Mountains. - Yajing Duan; Jingfeng Ge; Yanqing Liang; Yan Song (FSKD, 2010)

Study on function of urban land price on land spatial expansion based on the gravity model. - Li Wang; Zhongjiang Feng; Yanqing Liang; Jingfeng Ge; Yunliang Liu; Yuanyuan Cui (FSKD, 2010)