Peggy Agouris Anthony Stefanidis Kate Beard Mark Gahegan Vassilis J. Tsotras Dimitrios Gunopulos Knowledge Management Over Time-Varying Geospatial Datasets. 2004 DG.O http://dgrc.org/dgo2004/disc/presentations/geospatial/agouris.pdf db/conf/dgo/dgo2004.html#AgourisSBGTG04