TY - PROGRESS IN GEOGRAPHY A1 - ZHANGWang, SHEN Yuming T1 - The Spatial Characteristics of Producer Service Agglomeration in Beijing-Tianjin-Hebei Metropolitan Region Y1 - 2012-06-25 00:00:00.0 JF - PROGRESS IN GEOGRAPHY JO - PROGRESS IN GEOGRAPHY SP - 742 EP - 749 VL - 31 IS - 6 UR - {https://www.progressingeography.com/EN/10.11820/dlkxjz.2012.06.010} N1 - 10.11820/dlkxjz.2012.06.010 ER -