Patankar, Pratik Rajendra. “Refractive Index of Hydrogen Gas Using Hollow Glass Prism, Zinc Dust and Concentrated H2SO4”. International Journal of Research in Engineering, Science and Management, vol. 4, no. 7, July 2021, pp. 102-3, https://journal.ijresm.com/index.php/ijresm/article/view/979.