Peter van Oosterom Bart Maessen Wilko Quak Generic query tool for spatio-temporal data. 713-748 2002 16 International Journal of Geographical Information Science 8 http://taylorandfrancis.metapress.com/openurl.asp?genre=article&issn=1365-8816&volume=16&issue=8&spage=713 db/journals/gis/gis16.html#OosteromMQ02