SHRESTHA, N.; NAKARMI, J. J. One, Two and Three Photon Absorption in Atomic Hydrogen. Nepal Journal of Science and Technology, [S. l.], v. 12, p. 324–329, 2012. DOI: 10.3126/njst.v12i0.6520. Disponível em: https://nepjol.info./index.php/NJST/article/view/6520. Acesso em: 26 dec. 2024.