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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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Hjoerland, B.: Domain analysis in information science : eleven approaches - traditional as well as innovative (2002)
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Hjoerland, B.: Is classification necessary after Google? (2012)
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Hjoerland, B.; Hartel, J.: Introduction to a Special Issue of Knowledge Organization (2003)
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