Tobias Breyer Michael Klein Philipp Obreiter Birgitta König-Ries Activity-Based User Modeling in Service-Oriented Ad-Hoc-Networks. 43-56 http://dx.doi.org/10.1007/978-3-540-24614-5_4 2004 conf/ifip6/2004 WONS db/conf/ifip6/wons2004.html#BreyerKOK04