HusainU, V., M. A. Qaiser, and F. M. Z. Kaiji. “?REFRACTORY RAw MATERIALS OF PAKISTAN BEYOND THE YEAR 2000”. Biological Sciences - PJSIR, vol. 43, no. 5, Oct. 2000, pp. 324-8, https://v2.pjsir.org/index.php/biological-sciences/article/view/2060.