C. S. Pandey and N. Gupta. “Studies on the Preparation of Cross-Linked Polyvinylpyrrolidone-G-Poly (Maleic Anhydride-Co-Styrene) and the ImmobiliZation of Ovalbumin on the Graft Copolymer”. Journal of International Academy of Physical Sciences, vol. 1, no. 1-2, May 1997, pp. 19-26, https://www.iaps.org.in/journal/index.php/journaliaps/article/view/98.