[Nazeer, Mubbashar] Govt Coll Univ, Inst Arts & Sci, Dept Math, Chiniot Campus, Faisalabad 35400, Pakistan.
[Hussain, Farooq] Dept Math Sci FABS BUITEMS, Quetta 87300, Pakistan.
[Shahzad, Qasiar; Ali, Zulfiqar] Riphah Int Univ, Dept Math, Faisalabad Campus, Faisalabad 38000, Pakistan.
[Kadry, Seifedine] Beirut Arab Univ, Dept Math & Comp Sci, Beirut, Lebanon.
[Chu, Yu-Ming] Huzhou Univ, Dept Math, Huzhou 313000, Peoples R China.