Islam K. S. Altayi, and Imad A. Aldobouni , translators. “Catalytic Purification of Sulfur from Bituminous Impurity”. Pakistan Journal of Analytical & Environmental Chemistry, vol. 24, no. 2, Nov. 2024, pp. 155-66, https://doi.org/10.21743/pjaec/2023.12.04.