AbdulRidha Hussein, Mohammed. “A Proposed Multi-Layer Firewall to Improve the Security of Software Defined Networks”. International Journal of Interactive Mobile Technologies (iJIM) 17, no. 02 (January 25, 2023): pp. 153–165. Accessed July 18, 2024. https://online-journals.org/index.php/i-jim/article/view/36387.