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Supper, R.: PRECIS, ein computerunterstütztes alphabetisches Indexierungssystem (1975) 0.01

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Source: Nachrichten für Dokumentation. 26(1975) H.4/5, S.156-162

Austin, D.; Sørensen, J.: Zusammenarbeit in der Entwicklung and Anwendung von PRECIS (1978) 0.01

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