H. Benoudnine, M. Keche, A. Ouamri and M .S. Woolfson
Journal of Applied Sciences 9 ( 2 ): 201 - 213 , 2009
T.B. Stambouli, M. Keche and A. Ouamri
Journal of Applied Sciences 10 ( 11 ): 1015 - 1018 , 2010