CZAPIK, Damian. USING OPEN SOURCE INTELLIGENCE TO COMBAT HYBRID THREATS: REVIEW AND CASE STUDIES. Security Forum, [S. l.], v. 9, n. 2, 2026. Disponível em: https://ojs.wsb.edu.pl/index.php/sf/article/view/1760. Acesso em: 22 sep. 2026.