Lamri Douidi, Mahieddine Djoudi and Chabane Khentout
Journal of Computer Science 2 ( 3 ): 249 - 256 , 2006
Chabane Khentout, Mahieddine Djoudi and Lamri Douidi
Journal of Computer Science 2 ( 3 ): 269 - 275 , 2006