Sitnik S.M.(Ситник С.М.)(ORCID:0000...Professor, Chair of Applied Mathematics and Computer Modelling, Belgorod State University (BSU)Verified email at bsu.edu.ru
Elina ShishkinaVoronezh State UniversityVerified email at amm.vsu.ru
Ahmed FitouhiProfesseur de Mathématiques, Université de Tunis El ManarVerified email at fst.rnu.tn