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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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Gnoli, C.; Pullman, T.; Cousson, P.; Merli, G.; Szostak, R.: Representing the structural elements of a freely faceted classification (2011)
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Beghtol, C.: From the universe of knowledge to the universe of concepts : the structural revolution in classification for information retrieval (2008)
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Coates, E.J.: BC2 and BSO : presentation at the 36th Allerton Institute, 1994 session on preparing traditional classifications for the future (1995)
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Liu, S.: Decomposing DDC synthesized numbers (1996)
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