Puri, Neerja. “A Study on the Efficacy of Immunotherapy With Purified Protein Derivative for the Treatment of Recalcitrant Warts”. Nepal Journal of Dermatology, Venereology & Leprology 15, no. 1 (August 16, 2017): 12–16. Accessed May 2, 2024. https://www.nepjol.info/index.php/NJDVL/article/view/18046.