Kannan, G. K., Upendra Simha, Leeladhar Gaikwad, Nirmala L., and N.S. Kumar. “Bromo-Butyl Rubber for Face Piece of a Respiratory Mask”. Defence Science Journal 59, no. 5 (September 1, 2009): 505–511. Accessed June 15, 2025. https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/1552.