Shinsaku Kiyomoto Keith M. Martin Kazuhide Fukushima Privacy-Aware Location Database Service for Granular Queries. 28-37 2009 WISTP http://dx.doi.org/10.1007/978-3-642-03944-7_3 conf/wistp/2009 db/conf/wistp/wistp2009.html#KiyomotoMF09