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Nakamura, Y.; Ishikawa, T.: Expert systems for automatic UDC number assignment (1990)
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Nakamura, Y.: Expression of concepts in a classification system (1987)
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Ishikawa, T.; Nakamura, H.; Nakamura, Y.: UDC number automatic combination system (1994)
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Nakamura, Y.: Subdivisions vs. conjunctions : a discussion on concept theory (1998)
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