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Feldman, S.: Testing natural language : comparing DIALOG, TARGET, and DR-LINK (1996)
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Vigil, P.J.: Associative and Boolean retrieval : a comparative analysis (1994)
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O'Leary, M.: DIALOG TARGET's new age searching (1993)
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Bar-Ilan, J.: What do we know about links and linking? : a framework for studying links in academic environments (2005)
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Brandt, D.S.: Relevancy and searching the Internet (1996)
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