@inbook {panagiotopoulos2012ontological, title = {An Ontological Approach for Domain Knowledge Modeling and Management in E-Learning Systems}, booktitle = {Artificial Intelligence Applications and Innovations}, year = {2012}, pages = {95{\textendash}104}, publisher = {Springer}, organization = {Springer}, author = {Panagiotopoulos, Ioannis and Kalou, Aikaterini and Christos J. Pierrakeas and Kameas, Achilles} }