MERDASSI Abdelmoumene http://staff.univ-batna2.dz//merdassi_abdelmoumeneB1a.merdassi@univ-batna2.dzp: 0332211445
TEBBI Fatima Zohra http://staff.univ-batna2.dz/tebbi-fatima-zohraB3f.tebbi@univ-batna2.dzp: 0332211445