Goce Trajcevski Ouri Wolfson Fengli Zhang Sam Chamberlain The Geometry of Uncertainty in Moving Objects Databases. 233-250 2002 conf/edbt/2002 EDBT http://dx.doi.org/10.1007/3-540-45876-X_16 db/conf/edbt/edbt2002.html#TrajcevskiWZC02