Juyal, D. P. “Design of an R.F. Excited Helium Neon Visible Gas Laser and Study of the Optimal Conditions for Gas Mixtures and Pressures”. Defence Science Journal 22, no. 4 (October 1, 2014): 245–248. Accessed July 6, 2025. https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/6420.