KHANDOUDI Nassima http://staff.univ-batna2.dz/khandoudi_nassimaB4n.khandoudi@univ-batna2.dzp: 0331265874
MESSAOUDANI Karim http://staff.univ-batna2.dz/messaoudani_karimB12k.messaoudani@univ-batna2.dzp: 0332525256
