The OO jDREW Reference Implementation of RuleML. - Marcel Ball; Harold Boley; David Hirtle; Jing Mei; Bruce Spencer (RuleML, 2005)

Implementing RuleML Using Schemas, Translators, and Bidirectional Interpreters. - Marcel Ball; Harold Boley; David Hirtle; Jing Mei; Bruce Spencer (Rule Languages for Interoperability, 2005)

A match-making system for learners and learning objects. - Harold Boley; Virendrakumar C. Bhavsar; David Hirtle; Anurag Singh; Zhongwei Sun; Lu Yang (Interact. Technol. Smart Educ., 2005)

Toward the Identification and Elimination of Semantic Conflicts for the Integration of RuleML-based Ontologies. - Yevgen Biletskiy; David Hirtle; Olga Vorochek (CSWWS, 2006)