de la Fuente, Eduardo; Trinidad, Miguel A.; Tafoya, Daniel; Toledano-Juárez, Ivan; García-Flores, Samuel (2022). "The symbiotic and bipolar nebula M 2-9: Morphological variability of the collimated ionized wind arising from the core". Publications of the Astronomical Society of Japan. 74 (3): 594–601. arXiv:2203.00881. Bibcode:2022PASJ...74..594D. doi:10.1093/pasj/psac020.
de la Fuente, Eduardo; Trinidad, Miguel A.; Tafoya, Daniel; Toledano-Juárez, Ivan; García-Flores, Samuel (2022). "The symbiotic and bipolar nebula M 2-9: Morphological variability of the collimated ionized wind arising from the core". Publications of the Astronomical Society of Japan. 74 (3): 594–601. arXiv:2203.00881. Bibcode:2022PASJ...74..594D. doi:10.1093/pasj/psac020.
de la Fuente, Eduardo; Trinidad, Miguel A.; Tafoya, Daniel; Toledano-Juárez, Ivan; García-Flores, Samuel (2022). "The symbiotic and bipolar nebula M 2-9: Morphological variability of the collimated ionized wind arising from the core". Publications of the Astronomical Society of Japan. 74 (3): 594–601. arXiv:2203.00881. Bibcode:2022PASJ...74..594D. doi:10.1093/pasj/psac020.