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Humphreys, B.L.: ¬The 1994 Unified Medical Language System Knowledge Sources (1994)
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Lindberg, D.A.B.; Humphreys, B.L.: ¬The UMLS project : making the conceptual connection between users and the information they need (1993)
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Stuart, S.J.; Powell, T.; Humphreys, B.L.: ¬The Unified Medical Language System (UMLS) project (2002)
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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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