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Squires, S.J.: Access to biomedical information : the Unified Medical Language System (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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