O. Kalashniov, Andey, and Igor F. Mik halevich. “About the Single System of Protection Classes of Elements of Critical Information Infrastructure by the Criteria of Importance and Information Security”. International Journal of Engineering & Technology 7, no. 2.23 (April 20, 2018): 247–250. Accessed April 29, 2024. https://www.sciencepubco.com/index.php/ijet/article/view/11952.