Shlomo Berkovsky, Jill Freyne, Mac Coombe, Dipak Bhandari. Recommender algorithms in activity motivating games. In Xavier Amatriain, Marc Torrens, Paul Resnick, Markus Zanker, editors, Proceedings of the 2010 ACM Conference on Recommender Systems, RecSys 2010, Barcelona, Spain, September 26-30, 2010. pages 175-182, ACM, 2010. [doi]