Gemmell, J.; Schimoler, T. R.; Christiansen, L. & Mobasher, B. (2009), Improving Folkrank With Item-Based Collaborative Filtering, in Dietmar Jannach; Werner Geyer; Jill Freyne; Sarabjot Singh Anand; Casey Dugan; Bamshad Mobasher & Alfred Kobsa, ed., 'ACM RecSys'09 Workshop on Recommender Systems and the Social Web' , pp. 17--24 .