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Fed Univ Technol Owerri, Sch Phys Sci, Dept Math, Funct Anal & Optimizat Res Grp Lab FANORG, PMB 1526, Owerri, Imo State, Nigeria
Michael Okpara Univ Agr, Coll Phys & Appl Sci, Dept Math, PMB 7267, Umuahia, Abia State, Nigeria Fed Univ Technol Owerri, Sch Phys Sci, Dept Math, Funct Anal & Optimizat Res Grp Lab FANORG, PMB 1526, Owerri, Imo State, Nigeria