Lasse Klingbeil Tim Wark A Wireless Sensor Network for Real-Time Indoor Localisation and Motion Monitoring. 39-50 2008 IPSN http://doi.ieeecomputersociety.org/10.1109/IPSN.2008.15 conf/ipsn/2008 db/conf/ipsn/ipsn2008.html#KlingbeilW08