Address: Markusa st. 22, Vladikavkaz,
362027, RNO-A, Russia
Phone: (8672)50-18-06
E-mail: rio@smath.ru
Full name: Mourad Berraho
Work place: Ibn Tofail University, Faculty of Sciences
Work address: 14000 Kenitra, Morocco
E-mail: b.mourad87@hotmail.com, mourad.berraho@uit.ac.ma