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Tero, A.; Briggs, P.: Consistency versus compatibility : a question of levels? (1994)
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Boll, J.J.: DDC classification rules : an outline history and comparison of two sets of rules (1988)
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Peponakis, M.; Mastora, A.; Kapidakis, S.; Doerr, M.: Expressiveness and machine processability of Knowledge Organization Systems (KOS) : an analysis of concepts and relations (2020)
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Iyer, H.; Giguere, M.: Towards designing an expert system to map mathematics classificatory structures (1995)
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Pejtersen, A.M.; Albrechtsen, H.: Ecological work based classification schemes (2000)
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