TY - CHAP A1 - Moldvay, J. A1 - Bax, I. A1 - Frereichs, A. A1 - Schuh, M. T1 - Tagmantic: a social recommender service based on semantic tag graphs and tag clusters T2 - Proc. 2010 ACM Conf. Recommender Systems Y1 - 2010 SP - 345 EP - 346 CY - Barcelona, Spain ER -