Rodríguez, Luis F., Yolanda Gómez, J. Alberto López, Ma. Teresa García-Díaz, and David M. Clark. “H91α Radio Recombination Line and 3.5 Cm Continuum Observations of the Planetary Nebula NGC 3242”. Revista Mexicana de Astronomía y Astrofísica 46, no. 1 (January 11, 2016). Accessed April 18, 2024. https://journals.unam.mx/index.php/revmexaa/article/view/23600.