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Ceri, S.; Bozzon, A.; Brambilla, M.; Della Valle, E.; Fraternali, P.; Quarteroni, S.: Web Information Retrieval (2013)
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Berry, M.W.; Browne, M.: Understanding search engines : mathematical modeling and text retrieval (2005)
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Milstead, J.L.: Methodologies for subject analysis in bibliographic databases (1992)
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Habernal, I.; Konopík, M.; Rohlík, O.: Question answering (2012)
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Head, A.J.: ¬A question of interface design : how do online service GUIs measure up? (1997)
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