Department of Exact Sciences, Faculty of Applied and Exact Social Sciences, Federal University of the Jequitinhonha and Mucuri Valleys, Teófilo Otoni, Brazil
Prof. Abderrahmane Belguerna
Department of Mathematics, Centre Universitaire Salhi Ahmed dit Ali, Naama, Algeria
Dr. Oke Adeyemo
Department of Mathematical Sciences, North-West University, Mmabatho, South Africa