A new model for covert information collection, operations and intelligence. Academic Journal of Internal Affairs, [S. l.], v. 66, n. 5, p. 20–39, 2018. DOI: 10.38146/BSZ.2018.5.2. Disponível em: http://belugyiszemlejournal.pitservice.hu/index.php/belugyiszemle/article/view/460. Acesso em: 2 mar. 2026.