Kaoru Sezaki Izumi Kamiya Kohei Miyagawa Shin'ichi Konomi Rolling Out RFIDs: A Lightweight Positioning Environment for Ad Hoc Applications. 603-605 2008 SECON http://dx.doi.org/10.1109/SAHCN.2008.84 conf/secon/2008 db/conf/secon/secon2008.html#SezakiKMK08