Venelin Georgiev"On Conflicts, Interests, Goals, Power, and Security."CSDM Views(2020):views_040_.pdf
Stefan Hadjitodorov, Martin Sokolov"Blending New-generation Warfare and Soft Power: Hybrid Dimensions of Russia-Bulgaria Relations."Connections: The Quarterly Journal17,no. 1(2018):5-20.17.1.01_hybrid_dimensions_of_russia-bulgaria_relations.pdf