A Triangle-Based Logic for Affine-Invariant Querying of Two-Dimensional Spatial Data.

Sofie Haesevoets A Triangle-Based Logic for Affine-Invariant Querying of Two-Dimensional Spatial Data. 53-74 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3074&spage=53 2004 conf/cdb/2004 CDB db/conf/cdb/cdb2004.html#Haesevoets04