Chepkov, I. B., Zubariev, V. V., Sverhunov, O. O., & Zubariev, O. V. (2019). Оn the development of damage of information system operations and methodological issues of assessment of the efficiency of information security systems. Environmental Safety and Natural Resources, 30(2), 67–90. https://doi.org/10.32347/2411-4049.2019.2.67-90