Nedhath, Sneha; Rani, Sharmila; Subramaniam, Annapurni; Pancino, Elena (2025). "AstroSat/UVIT Study of NGC 663: First detection of Be+sdOB systems in a young star cluster". Astronomy & Astrophysics. 699: L1. arXiv:2506.08126. doi:10.1051/0004-6361/202555495.
Phelps, Randy L.; Janes, Kenneth A. (1993). "Young open clusters as probes of the star-formation process. 2: Mass and luminosity functions of young open clusters". Astronomical Journal. 106 (5): 1870–1884. Bibcode:1993AJ....106.1870P. doi:10.1086/116772.
Humphreys, R. M. (1978). "Studies of luminous stars in nearby galaxies. I. Supergiants and O stars in the Milky Way". Astrophysical Journal Supplement Series. 38: 309–350. Bibcode:1978ApJS...38..309H. doi:10.1086/190559.
Nedhath, Sneha; Rani, Sharmila; Subramaniam, Annapurni; Pancino, Elena (2025). "AstroSat/UVIT Study of NGC 663: First detection of Be+sdOB systems in a young star cluster". Astronomy & Astrophysics. 699: L1. arXiv:2506.08126. doi:10.1051/0004-6361/202555495.
Phelps, Randy L.; Janes, Kenneth A. (1993). "Young open clusters as probes of the star-formation process. 2: Mass and luminosity functions of young open clusters". Astronomical Journal. 106 (5): 1870–1884. Bibcode:1993AJ....106.1870P. doi:10.1086/116772.
Humphreys, R. M. (1978). "Studies of luminous stars in nearby galaxies. I. Supergiants and O stars in the Milky Way". Astrophysical Journal Supplement Series. 38: 309–350. Bibcode:1978ApJS...38..309H. doi:10.1086/190559.