Combining Description Logic and Defeasible Logic for the Semantic Web. - Kewen Wang 001; David Billington; Jeff Blee; Grigoris Antoniou (RuleML, 2004)

Reasoning with Levels of Modalities in BDI Logic. - Jeff Blee; David Billington; Abdul Sattar 001 (PRIMA, 2007)

Levels of Modalities for BDI Logic. - Jeff Blee; David Billington; Guido Governatori; Abdul Sattar 001 (Web Intelligence/IAT Workshops, 2008)

Levels of modality for BDI Logic. - Jeff Blee; David Billington; Guido Governatori; Abdul Sattar 001 (J. Appl. Log., 2011)