1. Faculté des Sciences de Tunis, LR10ES09 Modélisation mathématique, analyse harmonique et théorie du potentiel, Université de Tunis El Manar, Tunis Tunisie
2. Department of Mathematics, Quang Binh University, Dong Hoi, Quang Binh, Viet Nam
3. College of Sciences at Dammam, University of Imam Abdulrahman Bin Faisal, Dammam, Kingdom of Saudi Arabia
4. Basic and Applied Scientific Research Center, Imam Abdulrahman Bin Faisal University, Dammam, Kingdom of Saudi Arabia