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  1. Petry, W.; Werner, H.-J.: Anwendertraum: Kommunikations- und Retrieval-Software im Vergleich (1993) 10.09 
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  2. Petry, W.: Im Praxistest : die Retrievalsoftware Genesys/2 für Windows (1993) 10.09 
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  3. Petry, W.: Datenreisen billiger : wie man Telekommunikationskosten sparen kann (1994) 10.09 
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  4. Petry, W.; Schedelbeck, A.: Retrievalsoftware im Vergleich : Recherchieren in Datenbanken (1995) 10.09 
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