Muratkhan, R. and Satybaldina, D. (2015) “Assessment of risk of information security by means of the theory of fuzzy sets”, Bulletin of the Karaganda University. Mathematics Series, 3(79), pp. 66–74. Available at: https://mts.buketov.edu.kz/mathematics-vestnik/article/view/50 (Accessed: 8 December 2025).