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Madelung, H.-O.: Subject searching in the social sciences : a comparison of PRECIS and KWIC indexes indexes to newspaper articles (1982)
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Bidd, D.; Chevigny, L. de; Marshall, M.: PRECIS for subject access in a national audiovisual information system (1986)
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Austin, D.; Digger, J.A.: PRECIS: The Preserved Context Index System (1985)
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