Stephan Winter Sören Dupke Lin Jie Guan Carlos Vieira Historic Queries in Geosensor Networks. 148-161 2007 W2GIS http://dx.doi.org/10.1007/978-3-540-76925-5_11 conf/w2gis/2007 db/conf/w2gis/w2gis2007.html#WinterDGV07