Mateus, Simon. “Clarifying Jus Cogens, Erga Omnes and the Place of Third-Party Countermeasures in International Law”. Comparative and International Law Journal of Southern Africa 57, no. 1 (2024): 36 pages. Accessed July 22, 2024. https://unisapressjournals.co.za/index.php/CILSA/article/view/13329.