Bestenlehner, J. M.; et al., The VLT-FLAMES Tarantula Survey III. A very massive star in apparent isolation from the massive cluster R136", in Astronomy & Astrophysics, vol. 530, maggio 2011).arΧiv:1105.1775v1
Raul E. Puebla, D. John Hillier, Janos Zsargó, David H. Cohen, Maurice A. Leutenegger, X-ray, UV and optical analysis of supergiants: ε Ori, in Monthly Notices of the Royal Astronomical Society, vol. 456, n. 3, pp. 2907-2936.