Rivinius, Th.; Baade, D.; Hadrava, P.; Heida, M.; Klement, R. (2020). «A naked-eye triple system with a nonaccreting black hole in the inner binary». Astronomy & Astrophysics637 (L3): 11. arXiv:2005.02541. doi:10.1051/0004-6361/202038020.
Brown, A. G. A.; Verschueren, W. (1997). «High S/N Echelle spectroscopy in young stellar groups. II. Rotational velocities of early-type stars in SCO OB2». Astronomy and Astrophysics319: 811. Bibcode:1997A&A...319..811B. arXiv:astro-ph/9608089.
Rivinius, Th.; Baade, D.; Hadrava, P.; Heida, M.; Klement, R. (2020). «A naked-eye triple system with a nonaccreting black hole in the inner binary». Astronomy & Astrophysics637 (L3): 11. arXiv:2005.02541. doi:10.1051/0004-6361/202038020.
Brown, A. G. A.; Verschueren, W. (1997). «High S/N Echelle spectroscopy in young stellar groups. II. Rotational velocities of early-type stars in SCO OB2». Astronomy and Astrophysics319: 811. Bibcode:1997A&A...319..811B. arXiv:astro-ph/9608089.