John Buford Rakesh Kumar Greg Perkins Composition Trust Bindings in Pervasive Computing Service Composition. 261-266 2006 conf/percom/2006w PerCom Workshops http://doi.ieeecomputersociety.org/10.1109/PERCOMW.2006.31 db/conf/percom/percomw2006.html#BufordKP06