NATHANIEL, Babajide; A., Ogunlade C.; O., Aremu D.; T., Oladimeji S.; A., Akinyele O. Comparative Analysis of Upstream Petroleum Fiscal Systems of Three (3) Petroleum Exporting Countries: Indonesia, Nigeria and Malaysia. International Journal of Sciences: Basic and Applied Research (IJSBAR), Jordan, v. 15, n. 2, p. 99–115, 2014. Disponível em: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/2657. Acesso em: 6 oct. 2025.