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Univ Sci & Technol Oran Mohamed Boudiaf USTO MB, Fac Math & Comp Sci, Dept Math, BP 1505 El-MNOUAR, Bir El Djir 31000, Oran, Algeria Univ Sci & Technol Oran Mohamed Boudiaf USTO MB, Fac Math & Comp Sci, Dept Math, BP 1505 El-MNOUAR, Bir El Djir 31000, Oran, Algeria