Affiliation: | 1. Laboratoire de Mathématiques, P?le Sciences et Technologies, Université de La Rochelle, La Rochelle Cedex, France;2. NAAM Research Group, Department of Mathematics, Faculty of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia;3. Institute of Mathematics and Mathematical Modeling MES RK, Almaty, Kazakhstan;4. Al‐Farabi Kazakh National University, Almaty, Kazakhstan |