Wenting Liu Jun Feng 0001 Zhijian Wang 0002 Hao Shan Multi-thresholds Clustering Objects in a Road Network. 686-689 2008 CSSE (1) https://doi.org/10.1109/CSSE.2008.883 https://doi.ieeecomputersociety.org/10.1109/CSSE.2008.883 conf/csse/2008-1 db/conf/csse/csse2008-1.html#LiuFWS08