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Information sources in grey literature (1998)
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Pasanen-Tuomainen, I.: Does access meet availability at an OPAC? (1993)
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Fekrane, C.: Grey literature access via Internet, using WAIS (1994)
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Snyder, H.; Cronin, B.; Davenport, E.: What's the use of citation? : Citation analysis as a literature topic in selected disciplines of the social sciences (1995)
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Day, S.: SIGLE on CD-ROM (1992)
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