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![Advances in Information Retrieval 34th European Conference on IR Research, ECIR 2012, Barcelona, Spain, April 1-5, 2012, Proceedings [Paperback]](/itemImage/2/6/2/7/2_5255227.jpg "Advances in Information Retrieval 34th European Conference on IR Research, ECIR 2012, Barcelona, Spain, April 1-5, 2012, Proceedings [Paperback]")