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Robbio, A. de; Maguolo, D.; Marini, A.: Scientific and general subject classifications in the digital world (2001)
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GERHARD : eine Spezialsuchmaschine für die Wissenschaft (1998)
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Slavic, A.: Interface to classification : some objectives and options (2006)
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Pika, J.: Universal Decimal Classification at the ETH-Bibliothek Zürich : a Swiss perspective (2007)
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