TY - Acta Geographica Sinica A1 - Liang DING, Xinyi NIU, Xiaodong SONG T1 - Measuring the employment center system in Shanghai central city: A study using mobile phone signaling data Y1 - 2016-03-25 10:29:54.707 JF - Acta Geographica Sinica JO - Acta Geographica Sinica SP - 484 EP - 499 VL - 71 IS - 3 UR - {https://www.geog.com.cn/EN/10.11821/dlxb201603011} N1 - 10.11821/dlxb201603011 ER -