Benhamza Moussa, Kherici Nacer, Picard-bonnaud Francoise and Nezzal Abdelmalek
Online Journal of Earth Sciences 1 ( 1 ): 51 - 57 , 2007
Houha Belgacem, Kherici Nacer and Kachi Slimane
Research Journal of Applied Sciences 2 ( 11 ): 1120 - 1124 , 2007