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Loth, K.; Funk, H.: Subject search on ETHICS on the basis of the UDC (1990)
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Hug, H.: Walser, M. : Retrieval in the ETH database using the UDC (1991)
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Francu, V.: Construirea unui tezaur multilingv bazat pr CZU (1997)
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Francu, V.: Building a multilingual thesaurus based on UDC (1996)
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