Proceedings of the 4th WSEAS/IASME International Conference on Educational Technologies (EDUTE 08), Corfu, Greece, October 26-28, 2008, ISBN 978-960-474-013-0, pp.127-132

Proceedings of the 11th WSEAS International Conference on Automatic Control, Modelling and Simulation (ACMOS 09), Istanbul, Turkey, May 30-June 1, 2009, ISBN 978-960-474-082-6, pp.495-501

Proceedings of the 13th East-European Conference on Advances In Databases And Information Systems, Riga, Latvia, September 7-20, 2009, ISSN 0302-9743. pp.16-22

Proceedings of the 8th WSEAS International Conference on EActivities and the 8th WSEAS International Conference on Information Security and Privacy, Puerto de La Cruz, Tenerife, Spain, December 14-16, 2009, ISBN 978-960-474-143-4, 2009, pp.148-154