1. Department of Mathematical Analysis and Numerical Mathematics, Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia
2. Department of Mathematics and Computer Sciences, University of Adrar, Adrar, Algeria
3. Faculty of Technical Sciences, University of Novi Sad, Novi Sad, Serbia
4. Laboratory of Mathematics, Modeling and Applications (LaMMA), University of Adrar, Adrar, Algeria