Federica Cena Roberto Furnari A Model for Feature-Based User Model Interoperability on the Web. 37-54 2009 Advances in Ubiquitous User Modelling http://dx.doi.org/10.1007/978-3-642-05039-8_3 series/lncs/5830 db/series/lncs/lncs5830.html#CenaF09