Alessandro Carlotto Matteo Parodi Carlo Bonamico Fabio Lavagetto Massimo Valla Proximity classification for mobile devices using wi-fi environment similarity. 43-48 2008 MELT http://doi.acm.org/10.1145/1410012.1410023 conf/mobicom/2008melt db/conf/mobicom/melt2008.html#CarlottoPBLV08