V. Stoyanov, “The Flow of Refugees and International Terrorism – Primarily a European Problem, but with Historical Roots and Geopolitical Dimensions”, НТ, no. 2, pp. 7–40, Nov. 2016, Accessed: Jul. 23, 2026. Available: https://bjiep.e-dnrs.org/index.php/rp/article/view/5627