Region-Based Query Languages for Spatial Databases in the Topological Data Model Luca Forlizzi, Bart Kuijpers, and Enrico Nardelli   View Paper (PDF)   Return to Modeling and Languages BIBTEX spage=344},    crossref  = {conf/ssd/2003},    bibsource = {DBLP, http://dblp.uni-trier.de}   } ©2005 Association for Computing Machinery