[1] Cankaya Univ, Dept Math & Comp Sci, TR-06530 Ankara, Turkey
[2] Inst Space Sci, Magurele 76900, Romania
[3] Islamic Azad Univ, Oromiyeh Branch, Dept Phys, Oromiyeh, Iran
[4] Kazan VI Lenin State Univ, Dept Theoret Phys, Kazan 420008, Tatarstan, Russia