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"stevance", H F; Ignace, R; Crowther, P A; Maund, J R; Davies, B; Rate, G (2018). “Probing the rotational velocity of Galactic WO stars with spectropolarimetry”. Monthly Notices of the Royal Astronomical Society. 479 (4): 4535–4543. arXiv:1807.02117. Bibcode:2018MNRAS.479.4535S. doi:10.1093/mnras/sty1827.
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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.
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.