Ralph Lange Harald Weinschrott Lars Geiger André Blessing Frank Dürr Kurt Rothermel Hinrich Schütze On a Generic Uncertainty Model for Position Information. 76-87 2009 QuaCon http://dx.doi.org/10.1007/978-3-642-04559-2_7 conf/quacon/2009 db/conf/quacon/quacon2009.html#LangeWGBDRS09