Jan Zibuschka Lothar Fritsch Mike Radmacher Tobias Scherner Kai Rannenberg Enabling Privacy of Real-Life LBS. 325-336 2007 SEC http://dx.doi.org/10.1007/978-0-387-72367-9_28 conf/sec/2007 db/conf/sec/sec2007.html#ZibuschkaFRSR07