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Cosley, Dan and Lawrence, Steve and Pennock, David M.. REFEREE: an open framework for practical testing of recommender systems using ResearchIndex. VLDB '02: Proceedings of the 28th international conference on Very Large Data Bases. 35--46, VLDB Endowment, Year 2002.

Popescul, Alexandrin and Pennock, David M. and Lawrence, Steve. Probabilistic models for unified collaborative and content-based recommendation in sparse-data environments. Proceedings of the Seventeenth conference on Uncertainty in artificial intelligence. 437--444, Morgan Kaufmann Publishers Inc., San Francisco, CA, USA, Year 2001.

Dave, Kushal and Lawrence, Steve and Pennock, David M.. Mining the Peanut Gallery: Opinion Extraction and Semantic Classification of Product Reviews. Proceedings of the 12th International Conference on World Wide Web. WWW '03, 519--528, ACM, New York, NY, USA, Year 2003.

Schein, Andrew I. and Popescul, Alexandrin and Ungar, Lyle H. and Pennock, David M.. Methods and Metrics for Cold-start Recommendations. Proceedings of the 25th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval. SIGIR '02, 253--260, ACM, New York, NY, USA, Year 2002.