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Schulz, U.; Köhn, M.; Külper, U.; Will, G.: Projekt Kinder-OPAC (1995)
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Külper, U.; Schulz, U.; Wendt, H.; Will, G.: ¬Die Entwicklung des Kinder-OPACs BÜCHERSCHATZ : Kundennähe und Benutzerorientierung (1997)
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Külper, U.; Schulz, U.; Will, G.: Bücherschatz - a prototype of a children's OPAC (1997)
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