Zubair, Arif, and Syed Ikramuddin Ali. “THE VARIATION OF CALCIUM, MAGNESIUM, SODIUM, POTASSIUM AND BICARBO­ NATE CONCENTRATION, PH AND CONDUCTIVITY IN GROUNDWATER OF KARACHI REGION”. Biological Sciences - PJSIR 45, no. 3 (April 22, 2002): 151–156. Accessed November 22, 2024. https://v2.pjsir.org/index.php/biological-sciences/article/view/1775.