Mateus, Simon. “Analysing the Relationship Between Peremptory Norms of General International Law (Jus Cogens) and Obligations (Erga Omnes)”. South African Yearbook of International Law 46 (September 14, 2022): 26 pages. Accessed October 19, 2025. https://unisapressjournals.co.za/index.php/SAYIL/article/view/11224.