[1] King Abdulaziz Univ, Fac Sci, Dept Math, Nonlinear Anal & Appl Math Res Grp, Jeddah 21589, Saudi Arabia
[2] Univ Gujrat, Dept Math, Gujrat 50700, Pakistan
[3] Govt Coll Univ Lahore GCUL, Dept Math, Lahore 54000, Pakistan
[4] Univ Politehn Bucuresti, Dept Appl Math, Bucharest 060042, Romania
[5] Acad Romanian Scientists, 54 Splaiul Independentei, Bucharest 050094, Romania
[6] Univ Politehn Bucuresti, Fundamental Sci Appl Engn Res Ctr SFAI, Bucharest 060042, Romania
[7] Univ Basque Country UPV EHU, Inst Res & Dev Proc, Fac Sci & Technol, Campus Leioa, Leioa 48940, Spain