Zhylin, Artem, Serhii Valovyi, and Dmytro Marynin. “The Virtual Private Networks Protocols: Features of Creation and Perspective of Development”. Collection "Information Technology and Security" 5, no. 2 (December 31, 2017): 33–42. Accessed January 19, 2026. https://its.iszzi.kpi.ua/article/view/136947.