Kovalenko, E. V., and O. V. Pletnov. “Activity of Counterintelligence Agencies in the State Information Security System: NATO Countries’ Experience and Ukrainian Realities”. The Journal of V. N. Karazin Kharkiv National University. Series Law0, no. 26 (May 10, 2019): 136-139. Accessed December 5, 2025. https://periodicals.karazin.ua/law/article/view/12696.