Walborn, N. R.; et al. (1995-11), “The physics of massive OB stars in different parent galaxies. 1: Ultraviolet and optical spectral morphology in the Magellanic Clouds”, Publications of the Astronomical Society of the Pacific107 (708): 104-119, Bibcode: 1995PASP..107..104W, doi:10.1086/133524
Walborn, N. R.; et al. (1995-11), “The physics of massive OB stars in different parent galaxies. 1: Ultraviolet and optical spectral morphology in the Magellanic Clouds”, Publications of the Astronomical Society of the Pacific107 (708): 104-119, Bibcode: 1995PASP..107..104W, doi:10.1086/133524