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Petry, W.: Im Praxistest : die Retrievalsoftware Genesys/2 für Windows (1993)
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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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Petry-Eberle, A.: Information services : Beispiel für die Neuausrichtung firmeninterner Zentralfunktionen (1996)
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Cobb, M.A.; Petry, F.E.: Modeling spatial relationships within a fuzzy framework (1998)
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Schirmer, T.: Mit Datex-J auf die Datenautobahn : Neues bei Datex-J (1995)
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Neumann, G.: ¬Das *¬ISBC# erschließt Btx für die Schulbibliotheken (1994)
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Arnold, A.: Jetzt finden Sie alles schneller (2005)
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Datex-J - Bildschirmtext revisited (1993)
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Buchen Sie doch einfach selbst (1995)
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