TY - PROGRESS IN GEOGRAPHY A1 - Qingjing ZHENG, Teqi DAI, Zhuolin TAO, Mengmeng ZHANG T1 - Spatial heterogeneity of gravity model parameters: a case study of inter-city railway passenger flow in China Y1 - 2014-12-19 10:28:58.31 JF - PROGRESS IN GEOGRAPHY JO - PROGRESS IN GEOGRAPHY SP - 1659 EP - 1665 VL - 33 IS - 12 UR - {https://www.progressingeography.com/EN/10.11820/dlkxjz.2014.12.009} N1 - 10.11820/dlkxjz.2014.12.009 ER -