The following publications are possibly variants of this publication:
- A lexical metaschema for the UMLS semantic networkLi Zhang, Yehoshua Perl, Michael Halper, James Geller, George Hripcsak. artmed, 33(1):41-59, 2005. [doi]
- A metaschema of the UMLS based on a partition of its semantic networkMichael Halper, Zong Chen, James Geller, Yehoshua Perl. amia 2001: [doi]
- The cohesive metaschema: a higher-level abstraction of the UMLS Semantic NetworkYehoshua Perl, Zong Chen, Michael Halper, James Geller, Li Zhang, Yi Peng. jbi, 35(3):194-212, 2002. [doi]
- Enriching the structure of the UMLS semantic networkLi Zhang, Yehoshua Perl, Michael Halper, James Geller, James J. Cimino. amia 2002: [doi]