F. Tramper, S. M. Straal, D. Sanyal, H. Sana, A. de Koter, G. Gräfener, N. Langer, J. S. Vink, S. E. de Mink, L. Kaper: Massive stars on the verge of exploding. The properties of oxygen sequence Wolf-Rayet stars. In: Astronomy and Astrophysics. Band581, September 2015, doi:10.1051/0004-6361/201425390, arxiv:1507.00839v1, bibcode:2015A&A...581A.110T (Artikel: A110).
F. Tramper, S. M. Straal, D. Sanyal, H. Sana, A. de Koter, G. Gräfener, N. Langer, J. S. Vink, S. E. de Mink, L. Kaper: Massive stars on the verge of exploding. The properties of oxygen sequence Wolf-Rayet stars. In: Astronomy and Astrophysics. Band581, September 2015, doi:10.1051/0004-6361/201425390, arxiv:1507.00839v1, bibcode:2015A&A...581A.110T (Artikel: A110).
F. Tramper, S. M. Straal, D. Sanyal, H. Sana, A. de Koter, G. Gräfener, N. Langer, J. S. Vink, S. E. de Mink, L. Kaper: Massive stars on the verge of exploding. The properties of oxygen sequence Wolf-Rayet stars. In: Astronomy and Astrophysics. Band581, September 2015, doi:10.1051/0004-6361/201425390, arxiv:1507.00839v1, bibcode:2015A&A...581A.110T (Artikel: A110).
Peter S. Conti, William D. Vacca: The distribution of massive stars in the Galaxy. I – The Wolf-Rayet stars. In: The Astronomical Journal. 1990, bibcode:1990AJ....100..431C.
M. A. Dopita, T. A. Lozinskaia, P. J. McGregor, S. J. Rawlings: The extraordinary mass-loss bubble G2.4 + 1.4 and its central star. In: Astrophysical Journal. 1990, bibcode:1990ApJ...351..563D.