Georgios Meditskos
Department of Informatics
Aristotle University of Thessaloniki
54124 Thessaloniki, Greece
email: gmeditsk@csd.auth.gr
fax: ++30 2310998362

Nick Bassiliades
Department of Informatics
Aristotle University of Thessaloniki
54124 Thessaloniki, Greece
email: nbassili@csd.auth.gr
fax: ++30 2310998362