Jain, Ritesh, and Pradnya Ashish Vikhar. “Analysis of Vertical Scalability for Controller Placement in Software-Defined Networking and Its Implementation Using Tree Based Architecture”. International Journal of Intelligent Systems and Applications in Engineering 12, no. 19s (March 24, 2024): 276–283. Accessed September 19, 2025. https://www.ijisae.org/index.php/IJISAE/article/view/5064.