Rafique, M., and M. Yousuf. “?A REVIEW OF FELDSPATHIC RAW MATERIALS’ INCORPORATION IN GLASS AND CERAMICS”. Biological Sciences - PJSIR, vol. 41, no. 5, Oct. 1998, pp. 225-8, https://v2.pjsir.org/index.php/biological-sciences/article/view/2276.