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Nelson, S.J.: From meaning to term : semantic locality in the UMLS metathesaurus (1992)
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McCray, A.T.; Nelson, S.J.: ¬The representation of meaning in the UMLS (1995)
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Nelson, S.J.; Johnston, W.D.; Humphreys, B.L.: Relationships in Medical Subject Headings (MeSH) (2001)
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Nelson, S.J.; Powell, T.; Srinivasan, S.; Humphreys, B.L.: Unified Medical Language System® (UMLS®) Project (2009)
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