Martins, F.; et al. «A quantitative study of O stars in NGC2244 and the Mon OB2
association». Astronomy & Astrophysics, 538, 2-2012. arXiv: 1110.4509. Bibcode: 2012A%26A...538A..39M.
Martins, F.; et al. «A quantitative study of O stars in NGC2244 and the Mon OB2
association». Astronomy & Astrophysics, 538, 2-2012. arXiv: 1110.4509. Bibcode: 2012A%26A...538A..39M.