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The world has widely changed in terms of communicating, acquiring, and storing information. Hundreds of millions of people are involved in information retrieval tasks on a daily basis, in particular while using a Web search engine or searching their e-mail, making such field the dominant form of information access, overtaking traditional database-style searching. How to handle this huge amount of information has now become a challenging issue. In this paper, after recalling the main topicsdoi:10.1155/2012/573846 pmid:22778730 pmcid:PMC3388278 fatcat:gjemmg4e5jg3zkxyfzfknbisfa