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Brown, D.J.: Electronic publishing and libraries : Planning for the impact and growth to 2003 (1996)
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Robertson, S.E.: Overview of the Okapi projects (1997)
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Thelwall, M.: Bibliometrics to webometrics (2009)
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Narin, F.; Hamilton, K.S.: Bibliometric performance measures (1996)
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Robertson, S.: ¬The state of information retrieval : a researcher's view
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