GUT, Jerzy. Factors Determining the Participation of Private Military and Security Companies in 21st-Century Armed Conflicts and the Resulting Challenges for State Actors. Bezpieczeństwo. Teoria i Praktyka, [S. l.], n. 2, p. 75–87, 2026. DOI: 10.31749/2451-0718-btip-2026-2-004. Disponível em: https://journals.uafm.edu.pl/stp/article/view/386. Acesso em: 5 lis. 2026.