Contact Dorian Gorgan Computer Science Department Technical University of Cluj-Napoca Str. C. Daicoviciu 15, 400020 Cluj-Napoca, Romania tel. 0264 410478 e-mail: dorian.gorgan@cs.utcluj.ro   Costin Pribeanu ICI Bucharest tel. 021 3160736 / 294 e-mail: pribeanu@ici.ro   Teodor Ştefănuţ Computer Science Department Technical University of Cluj-Napoca Str. C. Daicoviciu 15, 400020 Cluj-Napoca, Romania tel. 0264 410478 e-mail: teodor.stefanut@cs.utcluj.ro