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- author's%3a%22Steinhagen%2c E.N.%22 2
- authors%3a%22Steinhagen%2c E.N.%22 2
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Petry, W.; Werner, H.-J.: Anwendertraum: Kommunikations- und Retrieval-Software im Vergleich (1993)
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- Cogito. 9(1993) H.2, S.18-22
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Petry, W.: Datenreisen billiger : wie man Telekommunikationskosten sparen kann (1994)
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- Cogito. 10(1994) H.4, S.17-22