A semantic web primer
Web Ontology Language: OWL
Representation results for defeasible logic
ACM Transactions on Computational Logic
Handbook on Ontologies
Frank Van Harmelen
Michael J. Maher
David Billington
Guido Governatori
Developing a Knowledge Management System Using an Ontological Approach in Global Organization
Temporalised normative positions in defeasible logic
Temporal deontic action logic for the verification of compliance to norms in ASP
Variants of temporal defeasible logics for modelling norm modifications
Rede de Ontologias: apoio semântico a linha de produtos de objetos de aprendizagem