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Year of Publication 19.12.1981

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Year of Publication 1982

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Year of Publication 01.11.1981

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Year of Publication 01.09.1997

Year of Publication 01.01.1975

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Year of Publication 1980

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Published in Journal of the American Society for Information Science (01.05.1991)

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Published in Database (Weston) (01.04.1994)

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Published in Journal of the American Society for Information Science (01.01.1992)

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Year of Publication 01.06.1979

Year of Publication 01.11.1978

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Year of Publication 01.12.1975

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Year of Publication 1976

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Year of Publication 01.03.1988

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Year of Publication 01.04.1975

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Year of Publication 01.05.1975

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Year of Publication 01.05.1975