Islam K. S. Altayi, and Imad A. Aldobouni , trans. “Catalytic Purification of Sulfur from Bituminous Impurity”. Pakistan Journal of Analytical & Environmental Chemistry 24, no. 2 (November 16, 2024): 155–166. Accessed July 4, 2025. https://pjaec.pk/index.php/pjaec/article/view/56.