Khan, I H, Fayyaz Mahmood, Samreen Zahra, Fozia Saleem, and Mustansar Naeem. “STUDIES ON THE UTILIZATION OF SPENT CATALYST USED IN OIL REFINERY”. Biological Sciences - PJSIR 47, no. 4 (August 30, 2004): 265–267. Accessed November 22, 2024. https://v2.pjsir.org/index.php/biological-sciences/article/view/1532.