Khan, A. R., Z. H. Farooqui, S.- ul-. Hasan, and A. Imran. “?PREPARATION OF HYDROGELS BASED ON PYA-ACRYLIC ACID USING N,N-METHYLENEBISACRYLAMIDE As CROSSLINKING AGENT”. Biological Sciences - PJSIR, vol. 43, no. 1, May 2000, pp. 60-64, https://v2.pjsir.org/index.php/biological-sciences/article/view/1995.