Dr. Vangelis Karkaletsis
Senior Researcher
Software and Knowledge Engineering Lab.

Inst. of Informatics & Telecommunications
N.C.S.R. "Demokritos"
15310 Aghia Paraskevi
Tel.:+30-210-6503197
Fax:+30-210-6532175
Greece
e-mail: vangelis@iit.demokritos.gr [1]