Ahmad, Irshad, Saqib Ali, and M Rasool Jane. 1999. “?PHYSICO-CHEMICAL STUDIES OF EFFLUENTS_AND EMISSIONS OF GHEEIEDIBLE OIL INDUSTRIES IN PAKISTAN”. Biological Sciences - PJSIR 42 (3):121-25. https://v2.pjsir.org/index.php/biological-sciences/article/view/2129.