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, Mathematics Department, Faculty of Science, Assiut University, Assiut 71516, Egypt (Egypt)
(Iran, Islamic Republic of)
(Saudi Arabia)

(Ethiopia)
(Serbia)
(Turkey)
, Department of Mathematics, Rada'a College of Education and Science, Albida University, Albida, Yemen (Yemen)
, \Vasile Alecsandri" University of Bacau, Bacau, Romania (Romania)
, Department of Mathematics, Andhra University,Andhra Pradesh, India - 530003 (India)
(Bosnia and Herzegovina)
, Department of Mathematics University of Malakand, Chakdara Dir(L), Khyber PakhtunKhwa, Pakistan (Pakistan)
, Sohar College of Applied Scinces, Mathematics Sction, PO BOX-135, P.C-311, Sohar, Oman (Oman)

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