Nectaria Tryfona Rosanne Price Christian S. Jensen Conceptual Models for Spatio-temporal Applications. 79-116 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2520&spage=79 2003 conf/chorochronos/2003 Spatio-Temporal Databases: The CHOROCHRONOS Approach db/conf/chorochronos/chorochronos2003.html#TryfonaPJ03