1. NAAM Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.
2. LaSIE, La Rochelle University, UMR CNRS 7356, Avenue M. Crépeau, 17042 La Rochelle Cedex, France
3. NAAM Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
4. Al-Farabi Kazakh National University, Al-Farabi Avenue 71, 050040, Almaty, Kazakhstan
5. Institute of Mathematics and Mathematical Modeling, 125 Pushkin str., 050010 Almaty, Kazakhstan
6. Department of Mathematics: Analysis, Logic and Discrete Mathematics, Ghent University, Krijgslaan 281, Building S8, B 9000 Ghent, Belgium.