1. LAMIS Laboratory, Echadid Cheikh Larbi Tebessi University , 12002 Tebessa , Algeria
2. LR10ES09 Modélisation matématique, analyse harmonique et téorie du potentiel, Faculté des Sciences, Université de Tunis El Manar , 2092 Tunis , Tunisie
3. Department of Mathematics and Computer Science, Faculty of Education, University of Ljubljana , 1000 Ljubljana , Slovenia
4. Department of Mathematics, Faculty of Mathematics and Physics, University of Ljubljana , 1000 Ljubljana , Slovenia
5. Department of Mathematics, Institute of Mathematics, Physics and Mechanics , 1000 Ljubljana , Slovenia