Mark Assad David J. Carmichael Judy Kay Bob Kummerfeld PersonisAD: Distributed, Active, Scrutable Model Framework for Context-Aware Services. 55-72 2007 conf/pervasive/2007 Pervasive http://dx.doi.org/10.1007/978-3-540-72037-9_4 db/conf/pervasive/pervasive2007.html#AssadCKK07