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): sid. 1870–1884. doi:10.1086/116772. Bibcode: 1993AJ....106.1870P.
Mermilliod, J. C.; Mayor, M.; Udry, S. (2008). ”Red giants in open clusters. XIV. Mean radial velocities for 1309 stars and 166 open clusters”. Astronomy & Astrophysics 485 (1): sid. 303–314. doi:10.1051/0004-6361:200809664. Bibcode: 2008A&A...485..303M.
Negueruela, I.; González-Fernández, C.; Marco, A.; Clark, J. S. (2011). ”A massive association around the obscured open cluster RSGC3”. Astronomy & Astrophysics 528: sid. A59. doi:10.1051/0004-6361/201016102. Bibcode: 2011A&A...528A..59N.
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: sid. 309–350. doi:10.1086/190559. Bibcode: 1978ApJS...38..309H.
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): sid. 1870–1884. doi:10.1086/116772. Bibcode: 1993AJ....106.1870P.
Mermilliod, J. C.; Mayor, M.; Udry, S. (2008). ”Red giants in open clusters. XIV. Mean radial velocities for 1309 stars and 166 open clusters”. Astronomy & Astrophysics 485 (1): sid. 303–314. doi:10.1051/0004-6361:200809664. Bibcode: 2008A&A...485..303M.
Negueruela, I.; González-Fernández, C.; Marco, A.; Clark, J. S. (2011). ”A massive association around the obscured open cluster RSGC3”. Astronomy & Astrophysics 528: sid. A59. doi:10.1051/0004-6361/201016102. Bibcode: 2011A&A...528A..59N.
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: sid. 309–350. doi:10.1086/190559. Bibcode: 1978ApJS...38..309H.