A. Bouhdjer - University of Biskra
H. Saidi - University of Biskra
A. Attaf - University of Biskra
M.S. Aida - Université Constantine 2
Mohamed JlassI - Research and Technology Center of Energy
I. Bouhaf - University of Biskra
Y. Benkhetta - University of Biskra
H. Bendjedidi - University of Biskra