Basu, C., Hirsh, H. & Cohen, W. (1998). Recommendation as classification: using social and content-based information in recommendation. AAAI '98/IAAI '98: Proceedings of the fifteenth national/tenth conference on Artificial intelligence/Innovative applications of artificial intelligence (p./pp. 714--720), Menlo Park, CA, USA: American Association for Artificial Intelligence. ISBN: 0-262-51098-7