Gabriele Lenzini Ynze van Houten Wolf Huijsen Mark Melenhorst Shall I Trust a Recommendation? Towards an Evaluation of the Trustworthiness of Recommender Sites. 121-128 2009 ADBIS (Workshops) http://dx.doi.org/10.1007/978-3-642-12082-4_16 conf/adbis/2009w db/conf/adbis/adbis2009w.html#LenziniHHM09