Sylvain Giroux Jérémy Bauchet Hélène Pigot Dany Lussier-Desrochers Yves Lachappelle Pervasive behavior tracking for cognitive assistance. 86 2008 PETRA http://doi.acm.org/10.1145/1389586.1389684 conf/petra/2008 db/conf/petra/petra2008.html#GirouxBPLL08