N. Moussaoui, M. Bouafia and Dj. Boubetra
Journal of Engineering and Applied Sciences 2 ( 9 ): 1440 - 1442 , 2007
Ai Manallah, M. Bouafia and D.J. Bouzid
Journal of Engineering and Applied Sciences 2 ( 10 ): 1519 - 1523 , 2007