Berendt, B. (Bearb.) ; Hotho, A. (Bearb.) ; Mladenic, D. (Bearb.) ; Semeraro, G. (Bearb.): From Web to Social Web: Discovering and Deploying User and Content Profiles . 4736 : Springer, 2007 (LNCS). - ISBN 978-3-540-74950-9