Ius cogens - ius dispositivum. Studia Prawnicze / The Legal Studies, [S. l.], n. 2-3 (116-117), p. 31–50, 1993. DOI: 10.37232/sp.1993.2-3.2. Disponível em: https://czasopisma.inp.pan.pl/index.php/sp/article/view/2259. Acesso em: 6 oct. 2025.