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Petry, W.: Im Praxistest : die Retrievalsoftware Genesys/2 für Windows (1993)
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Petry, W.: Datenreisen billiger : wie man Telekommunikationskosten sparen kann (1994)
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Petry, A.: Wissen auf schnellen Scheiben (2004)
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Petry, W.; Schedelbeck, A.: Retrievalsoftware im Vergleich : Recherchieren in Datenbanken (1995)
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Graumann, S.: Aufbau, Struktur und Probleme bei der Erstellung eines EDV-gestützten Thesaurus (1985)
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Matrix of WWW indices : a comparison of Internet indexing tools (1995)
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