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Hawkins, D.T.: On-line information retrieval bibliography : 1965-1976 (1977)
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Hawkins, D.T.: Growth trends in the electronic information services market (1993)
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Hawkins, D.T.: Growth trends in the electronic information services market (1994)
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Ma, W.: ¬A database selection expert system based on reference librarians's database selection strategy : a usability and empirical evaluation (2002)
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