Marco Gruteser Baik Hoh On the Anonymity of Periodic Location Samples. 179-192 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3450&spage=179 2005 conf/spc/2005 SPC db/conf/spc/spc2005.html#GruteserH05