科研之友
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摘要
the practical, theoretical, and historic antecedents necessary for the rise of a new area in information sciences are analyzed: the recovery and the importance of the web as a new space for the interaction of man with the hypertextual information. the concepts of superficial web and deep web are exposed, and some of the main useful search engines to explore the deep web, as well as the new tools for the information retrieval, such as the textual and data mining and the discovery of know-how in databases are described.
