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Nicholls, P.; Sutherland, T.: CD-ROM databases : a survey of commercial publishing activity (1992)
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Swanepoel, M.: ¬The availability of electronic grey literature (1993)
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Weide, J.: CD-ROM reference survey (1992)
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Armstrong, C.J.; Wheatley, A.: Writing abstracts for online databases : results of database producers' guidelines (1998)
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