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Harper F, Li X, Chen Y, Konstan J. Social Comparisons to Motivate Contributions to an Online Community.. In: Persuasive Technology. Palo Alto, CA; 2007.
Harper FM, Li X, Chen Y, Konstan JA. An Economic Model of User Rating in an Online Recommender System. In: 10th International Conference on User Modeling. Edinburgh, UK; 2005.