NIVEDITA. Study of Threshold Condition and Population Inversion in Helium-Neon laser. Eduzone: International Peer Reviewed/Refereed Multidisciplinary Journal, [S. l.], v. 13, n. 2, p. 203–213, 2024. Disponível em: https://eduzonejournal.com/index.php/eiprmj/article/view/911. Acesso em: 19 feb. 2026.