Using the metaschema to audit UMLS classification errors. - Huanying Helen Gu; Hua Min; Yi Peng; Li Zhang 048; Yehoshua Perl (AMIA, 2002)

Enriching the structure of the UMLS semantic network. - Li Zhang 048; Yehoshua Perl; Michael Halper; James Geller; James J. Cimino (AMIA, 2002)

The cohesive metaschema: a higher-level abstraction of the UMLS Semantic Network. - Yehoshua Perl; Zong Chen; Michael Halper; James Geller; Li Zhang 048; Yi Peng (J. Biomed. Informatics, 2002)

Designing metaschemas for the UMLS enriched semantic network. - Li Zhang 048; Yehoshua Perl; Michael Halper; James Geller (J. Biomed. Informatics, 2003)

Auditing concept categorizations in the UMLS. - Huanying Gu; Yehoshua Perl; Gai Elhanan; Hua Min; Li Zhang 048; Yi Peng (Artif. Intell. Medicine, 2004)

Model Formulation: An Enriched Unified Medical Language System Semantic Network with a Multiple Subsumption Hierarchy. - Li Zhang 048; Yehoshua Perl; Michael Halper; James Geller; James J. Cimino (J. Am. Medical Informatics Assoc., 2004)

An expert study evaluating the UMLS lexical metaschema. - Li Zhang 048; George Hripcsak; Yehoshua Perl; Michael Halper; James Geller (Artif. Intell. Medicine, 2005)

A lexical metaschema for the UMLS semantic network. - Li Zhang 048; Yehoshua Perl; Michael Halper; James Geller; George Hripcsak (Artif. Intell. Medicine, 2005)

Model Formulation: Relationship Structures and Semantic Type Assignments of the UMLS Enriched Semantic Network. - Li Zhang 048; Michael Halper; Yehoshua Perl; James Geller; James J. Cimino (J. Am. Medical Informatics Assoc., 2005)

Comparing and consolidating two heuristic metaschemas. - Yan Chen 009; Yehoshua Perl; James Geller; George Hripcsak; Li Zhang 048 (J. Biomed. Informatics, 2008)