TOFIQ MUHAMMED, S. .; HIKMT ALI, S. .; Abdulla Salih ‌. Analysis of the OPEC oil price crisis during the period between the years 1961 - 2019). Halabja University Journal, [S. l.], v. 5, n. 4, p. 303–325, 2020. DOI: 10.32410/huj-10355. Disponível em: https://huj.uoh.edu.iq/index.php/HUJ/article/view/huj-10355. Acesso em: 8 aug. 2022.