[1] Univ WAH, Dept Math, Quaid Ave, Rawalpindi 47040, Punjab, Pakistan
[2] Quaid I Azam Univ, Dept Math, Islamabad 44000, Pakistan
[3] King Khalid Univ, Coll Sci, Dept Math, Abha 61413, Saudi Arabia
[4] Natl Univ Technol, NUTECH Sch Appl Sci & Humanities, Islamabad 44000, Pakistan
[5] King AbdulAziz Univ, Fac Sci, Dept Math, Nonlinear Anal & Appl Math NAAM Res Grp, Jeddah 21589, Saudi Arabia
[6] Mohi Ud Din Islamic Univ, Dept Math, Nerian Sharif 12010, Azad Jammu & Ka, Pakistan