Analyzing theme, space, and time: an ontology-based approach.

Matthew Perry Farshad Hakimpour Amit P. Sheth Analyzing theme, space, and time: an ontology-based approach. 147-154 2006 conf/gis/2006 GIS http://doi.acm.org/10.1145/1183471.1183496 db/conf/gis/gis2006.html#PerryHS06