SYKUNA, S.; ZAJADŁO, J. The Theory of Hard Cases and Humanitarian Intervention. Polish Review of International and European Law, [S. l.], p. 11–60, 2012. DOI: 10.21697/priel.2012.0.0.01. Disponível em: https://czasopisma.uksw.edu.pl/index.php/priel/article/view/1161. Acesso em: 3 may. 2024.