On-Line Discovery of Dense Areas in Spatio-temporal Databases Marios Hadjieleftheriou, George Kollios, Dimitrios Gunopulos, and Vassilis J. Tsotras   View Paper (PDF)   Return to Mobility and Moving Points Management BIBTEX spage=306},    crossref  = {conf/ssd/2003},    bibsource = {DBLP, http://dblp.uni-trier.de}   } ©2005 Association for Computing Machinery