TY - Acta Geographica Sinica A1 - HUANG Xiaodong, MA Haitao, MIAO Changhong T1 - Connectivity characteristics for city networks in China based on innovative enterprises Y1 - 2021-06-25 00:00:00.0 JF - Acta Geographica Sinica JO - Acta Geographica Sinica SP - 835 EP - 852 VL - 76 IS - 4 UR - {https://www.geog.com.cn/EN/10.11821/dlxb202104005} N1 - 10.11821/dlxb202104005 ER -