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Bernier, C.L.: Subject indexes (1980)
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Vinayak, K.; Taneja, K.K.: Chain procedure and its influence on other precoordinate indexing systems (1986)
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Hartmann, K.: Pressedatenbank: Online-Retrieval und gedruckte Register (1984)
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Hartmann, K.: PDS: Retrievalsoftware für die Pressedatenbank (1984)
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