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Univ Sulaimani, Coll Educ, Dept Math, Sulaimani, Kurdistan Regio, Iraq
East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China Univ Sulaimani, Coll Educ, Dept Math, Sulaimani, Kurdistan Regio, Iraq