K. Schoefegger, P. Seitlinger, и T. Ley. Proceedings of the 1st Workshop on Recommender Systems for Technology Enhanced Learning (RecSysTEL 2010), 1, стр. 2829 - 2838. (07.09.2010)
J. Tang, H. fung Leung, Q. Luo, D. Chen, и J. Gong. IJCAI'09: Proceedings of the 21st international jont conference on Artifical intelligence, стр. 2089--2094. San Francisco, CA, USA, Morgan Kaufmann Publishers Inc., (2009)