Mengesha, Zewdu. “Unratified Treaties, Unilateral Declarations and Modus Vivendi: Circumstances to Be Considered to Have Effect on State Parties”. Bahir Dar University Journal of Law 4, no. 1 (April 6, 2022): 176-207. Accessed November 21, 2025. https://journals.bdu.edu.et/index.php/bdujl/article/view/879.