RODRÍGUEZ, L. F.; GÓMEZ, Y.; GUZMÁN, L. Ionization-bounded and Density-bounded Planetary Nebulae. Revista Mexicana de Astronomía y Astrofísica, [S. l.], v. 45, n. 1, 2016. Disponível em: https://journals.unam.mx/index.php/revmexaa/article/view/23719. Acesso em: 14 may. 2024.