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Pflug, G.: Verbundsysteme der Datenverarbeitung im Bibliothekswesen (1974) 0.01

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Source: Bibliotheksforum Bayern. 2(1974) H.3, S.246-254

Pflug, G.: Information Retrieval System (1972) 0.00

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Source: Libri. 22(1972) no.1, S.85-92