P. Avgeriou, S. Retalis, and M. Skordalakis. Panhellenic Conference on Informatics, volume 2563 of Lecture Notes in Computer Science, page 183-200. Springer, (2001)
S. Michaelides, F. Tymvios, D. Paronis, and A. Retalis. Soft Computing in Green and Renewable Energy Systems, volume 269 of Studies in Fuzziness and Soft Computing, Springer, (2011)