Pierrakeas, Christos J, Ioannis  Panagiotopoulos, and Achilles  Kameas. 2013. ?A Correlation Verb (Corrverb) Ontology For Object Properties Specification Within Knowledge Domain Representations?. In Proceedings of the 6th Balkan Conference in Informatics, Proceedings of the 6th Balkan Conference in Informatics, ACM, 195?200.

Panagiotopoulos, Ioannis, Aikaterini  Kalou, Christos J Pierrakeas, and Achilles  Kameas. 2012. ?An Ontological Approach For Domain Knowledge Modeling And Management In E-Learning Systems?. In Artificial Intelligence Applications and Innovations, Artificial Intelligence Applications and Innovations, Springer, 95?104.

Panagiotopoulos, Ioannis, Aikaterini  Kalou, Christos J Pierrakeas, and Achilles  Kameas. 2012. ?An Ontology-Based Model For Student Representation In Intelligent Tutoring Systems For Distance Learning?. In Artificial Intelligence Applications and Innovations, Artificial Intelligence Applications and Innovations, Springer Berlin Heidelberg, 296?305.