Network Kernel Density Estimation for the Analysis of Facility POI Hotspots
YU Wenhao, AI Tinghua, LIU Pengcheng, HE Yakun
Acta Geodaetica et Cartographica Sinica . 2015, (12): 1378 -1383 .  DOI: 10.11947/j.AGCS.2015.20140538