[1] Mansoura Univ, Fac Engn, Math & Engn Phys Dept, PO 35516, Mansoura, Egypt
[2] Univ Aveiro, Dept Math, P-3810193 Aveiro, Portugal
[3] Univ Aveiro, CIDMA, P-3810193 Aveiro, Portugal
[4] Shivaji Univ, Dept Math, Kolhapur 416004, Maharashtra, India
[5] Suez Canal Univ, Fac Comp & Informat, Dept Basic Sci, Ismailia 41522, Egypt