Phelps, M., T. Karatrantos, V. Theofilopoulos, and D. Kudlacek. “Law Enforcement Responses to Violent Extremism in Greece”. European Law Enforcement Research Bulletin, no. 18, Feb. 2019, pp. 39-51, https://bulletin.cepol.europa.eu/index.php/bulletin/article/view/381.