Mohand-Said Hacid,
Informatique, Université Lyon 1, France
Slimane Hammoudi,
Computer Science Department, ESEO, ERIS, France
Abdelmalek Metrouh,
Department of Mathematics and Computer Science, university of Tebessa, Algeria
Abdel-Badeeh M. Salem,
Faculty of Computer and Information Sciences,Computer Science Dept., Ain Shams University, Egypt