Extending the Unified Modeling Language for ontology development. - Kenneth Baclawski; Mieczyslaw M. Kokar; Paul A. Kogut; Lewis Hart; Jeffrey E. Smith; Jerzy Letkowski; Pat Emery (Softw. Syst. Model., 2002)

Usage Scenarios and Goals for Ontology Definition Metamodel. - Lewis Hart; Patrick Emery; Robert M. Colomb; Kerry Raymond; Dan Chang; Yiming Ye; Elisa F. Kendall; Mark Dutra (WISE, 2004)

The Object Management Group Ontology Definition Metamodel. - Robert M. Colomb; Kerry Raymond; Lewis Hart; Patrick Emery; Chris Welty; Guo Tong Xie; Elisa F. Kendall (Ontologies for Software Engineering and Software Technology, 2006)