Spatial Combination of Finance and Center Level Identify Based on K-means Clustering: A Case Study of the Changjiang River Delta
Zhi-min YANG, Xiang-yu HUA, Ya-fen YE, Yuan-hai SHAO
SCIENTIA GEOGRAPHICA SINICA . 2015, (2): 144 -150 .  DOI: 10.13249/j.cnki.sgs.2015.01.144