[1] Univ Tabriz, Dept Math Sci, Tabriz 5166614766, Iran
[2] Badji Mokhtar Univ, Dept Phys, Radiat Phys Lab, Anaba 2300, Algeria
[3] Ege Univ, Dept Math, TR-35100 Izmir, Turkey
[4] Univ S Florida, Dept Math & Stat, Tampa, FL 33620 USA
[5] Delaware State Univ, Dept Math Sci, Dover, DE 19901 USA