Today, because of the continuing explosion of information, it is necessary that the centers of organizing information evolve in the sense of being mere repositories of printed information to real centers of digital information "global." To achieve these information centers should use all mechanisms provided by new technologies to meet the information needs of a community increasingly demanding.Faced with such a situation information centers tend to develop a set of strategies that focus their attention towards a new horizon of digital techniques that allow organizing this mass of information, in order to facilitate access to and hence their recovery. Through this article are some resources that are used to support the electronic information retrieval.
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