Varbanov, Pavel. "Perspectives in the Design of a Modern  Cybersecurity Training Programme: The ECHO Approach." Information & Security: An International Journal 53, no. 2 (2022): 177-190.

Tagarev, Todor. "A Means of Comparing Military Budgeting Processes in South East Europe." Information & Security: An International Journal 11 (2003): 95-135.