Hybrid Threats. A Strategic Communications Perspective. NATO Strategic Communications Centre of Excellence, 2019.
Kovacheva, Ralitsa. "
Hybrid Threats in Bulgarian Media."
Information & Security: An International Journal 43, no. 3 (2019): 333-348.
MS, Hwang, Chou YC, Wu CC, and Yang CY. "
An Improvement of Tseng–Wu Group Key Exchange Protocol." In
Recent Developments in Intelligent Computing, Communication and Devices. Advances in Intelligent Systems and Computing. Vol. 752. Singapore: Springer, 2019.