MARSZAŁEK, Piotr Krzysztof. The system of collective defence towards hybrid threats in Europe in the post-bipolar world. Journal of the Belarusian State University. International Relations, [S. l.], n. 2, p. 20–24, 2019. Disponível em: https://journals.bsu.by/index.php/internationalRelations/article/view/1330. Acesso em: 18 jul. 2026.