bias collaborative filtering collaborative systems contact recommendation context diversity evaluation finance group recommendation hybrid recommendation information extraction information retrieval information retrieval models information retrieval theory knn link prediction machine learning metasearch metrics multi-armed bandits multimedia retrieval news retrieval nlp non-random missing data novelty performance prediction personalization popularity query aspect rank aggregation rank fusion recommender systems relation extraction semantic annotation semantic search semantics social networks time web search web services
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S. Vargas, P. Castells.
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