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Petry, W.: Datenreisen billiger : wie man Telekommunikationskosten sparen kann (1994) 0.10

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Object: DATEX-P
Source: Cogito. 10(1994) H.4, S.17-22

Petry, W.; Werner, H.-J.: Anwendertraum: Kommunikations- und Retrieval-Software im Vergleich (1993) 0.03

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Source: Cogito. 9(1993) H.2, S.18-22