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Hsieh-Yee, I.: ¬The retrieval power of selected search engines : how well do they address general reference questions and subject questions? (1998)
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Rusch-Feja, D.: Subject oriented collection of information resources from the Internet (1997)
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Liu, G.Z.: Semantic vector space model : implementation and evaluation (1997)
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Garnsey, M.R.: What distance learners should know about information retrieval on the World Wide Web (2002)
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Ravana, S.D.; Rajagopal, P.; Balakrishnan, V.: Ranking retrieval systems using pseudo relevance judgments (2015)
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