Gerald Bauer Paul Lukowicz Developing a Sub Room Level Indoor Location System for Wide Scale Deployment in Assisted Living Systems. 1057-1064 2008 ICCHP http://dx.doi.org/10.1007/978-3-540-70540-6_158 conf/icchp/2008 db/conf/icchp/icchp2008.html#BauerL08