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)

Collaborative filtering and inference rules for context-aware learning object recommendation. - Daniel Lemire; Harold Boley; Sean McGrath; Marcel Ball (Interact. Technol. Smart Educ., 2005)

The Compression Power of Symbolic Pattern Databases. - Marcel Ball; Robert C. Holte (ICAPS, 2008)