CURTIS, Willie. The Grey Zone: The United States and the Illusory Zone Between Peacekeeping and Peace Enforcement. Journal of Conflict Studies, [S. l.], v. 18, n. 1, 1998. Disponível em: https://journals.lib.unb.ca/index.php/JCS/article/view/11671. Acesso em: 13 may. 2024.