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M. Cherif Bassiouni, International Crimes: "Jus Cogens" and "Obligatio Erga Omnes", Law and Contemporary Problems, Vol. 59, No. 4, Accountability for International Crimes and Serious Violations of Fundamental Human Rights (Autumn, 1996), pp. 63-74
M. Cheríf Bassiouni (Mon,) studied this question.