Shalamanov, Velizar, Vassil Sabinski, and Trayan Georgiev. "Optimization of the Chief Information Officer Function in Large Organizations." Information & Security: An International Journal 46, no. 1 (2020): 13-26.

Atanassov, Ventzislav. "Implementation Hierarchy and CIO Organization in Bulgaria?s Public Administration." Information & Security: An International Journal 42 (2019): 83-94.