Ahmed Khaleel, T., O. Anwer Nafea Alani, and O. H. Al-Abdulqader. “A Review on Fog Computing: Research Challenges and Future Directions”. Al-Rafidain Engineering Journal (AREJ), vol. 28, no. 1, Mar. 2023, pp. 341-50, doi:10.33899/rengj.2022.136642.1211.