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Chu, Y. -H (1981). "Galactic ring nebulae associated with Wolf-rayet stars. I. Introduction and classification". The Astrophysical Journal. 249: 195. Bibcode:1981ApJ...249..195C. doi:10.1086/159275.
Groh, Jose H.; Meynet, Georges; Ekström, Sylvia; Georgy, Cyril (2014). "The evolution of massive stars and their spectra I. A non-rotating 60 Msun star from the zero-age main sequence to the pre-supernova stage". Astronomy & Astrophysics. 564: A30. arXiv:1401.7322. Bibcode:2014A&A...564A..30G. doi:10.1051/0004-6361/201322573. S2CID118870118.
Groh, Jose H.; Meynet, Georges; Ekström, Sylvia; Georgy, Cyril (2014). "The evolution of massive stars and their spectra I. A non-rotating 60 Msun star from the zero-age main sequence to the pre-supernova stage". Astronomy & Astrophysics. 564: A30. arXiv:1401.7322. Bibcode:2014A&A...564A..30G. doi:10.1051/0004-6361/201322573. S2CID118870118.
Smith, Lindsey F.; Shara, Michael M.; Moffat, Anthony F. J. (1990). "Distances of Galactic WC stars from emission-line fluxes and a quantification of the WC classification". The Astrophysical Journal. 358: 229. Bibcode:1990ApJ...358..229S. doi:10.1086/168978. ISSN0004-637X.