MAHMOUD, Abdelmotalab Osman; MOHAMED, Asim Ibrahim. The Effect of Operating Costs on Environmental Degradation under International Environmental Standards: Case study - Khartoum State. Journal of Economic, Administrative and Legal Sciences, New Mexico, United States, v. 4, n. 9, p. 159–143, 2020. DOI: 10.26389/AJSRP.O080320. Disponível em: https://www.ajsrp.ojsexpert.com/index.php/jeals/article/view/2778. Acesso em: 20 dec. 2025.