Badir Mahmood, Ahmed, and Dr. A.I.A.Jabbar. “Analysis and Design of a Novell VPN Switch”. Al-Rafidain Engineering Journal (AREJ) 13, no. 4 (December 1, 2005): 11–25. Accessed September 27, 2025. https://jwups.uomosul.edu.iq/index.php/arej/article/view/30894.