[1] Fed Univ Technol Owerri, Sch Phys Sci, Dept Math, Funct Anal & Optimizat Res Grp Lab FANORG, PMB 1526, Owerri, Nigeria
[2] Govt Coll Univ, Dept Math, Katchery Rd, Lahore 54000, Pakistan
[3] China Med Univ, China Med Univ Hosp, Dept Med Res, Taichung 40402, Taiwan
[4] Univ Basque Country, Inst Res & Dev Proc, Campus Leioa Bizkaia,POB 644, Leioa 48940, Spain
[5] Natl Univ Comp & Emerging Sci, Dept Sci & Humanities, Lahore Campus, Lahore 54000, Pakistan