McSwain, M. Virginia; Gies, Douglas R. (November 2005), "The Evolutionary Status of Be Stars: Results from a Photometric Study of Southern Open Clusters", The Astrophysical Journal Supplement Series, 161 (1): 118–146, arXiv:astro-ph/0505032, Bibcode:2005ApJS..161..118M, doi:10.1086/432757.
Dias, W. S.; et al. (September 2001), "Proper motions of open clusters within 1 kpc based on the TYCHO2 Catalogue", Astronomy and Astrophysics, 376 (2): 441–447, Bibcode:2001A&A...376..441D, doi:10.1051/0004-6361:20011021.
Bayer, C.; et al. (November 2000), "CCD photometric search for peculiar stars in open clusters. I. NGC 2169, Melotte 105 and NGC 6250", Astronomy and Astrophysics Supplement, 147: 99–109, Bibcode:2000A&AS..147...99B, doi:10.1051/aas:2000294.
McSwain, M. Virginia; Gies, Douglas R. (November 2005), "The Evolutionary Status of Be Stars: Results from a Photometric Study of Southern Open Clusters", The Astrophysical Journal Supplement Series, 161 (1): 118–146, arXiv:astro-ph/0505032, Bibcode:2005ApJS..161..118M, doi:10.1086/432757.
Herbst, W. (November 1977), "Extinction law in dust clouds and the young southern cluster NGC 6250: further evidence for high values of R", Astronomical Journal, 82: 902–907, Bibcode:1977AJ.....82..902H, doi:10.1086/112144.
Dias, W. S.; et al. (September 2001), "Proper motions of open clusters within 1 kpc based on the TYCHO2 Catalogue", Astronomy and Astrophysics, 376 (2): 441–447, Bibcode:2001A&A...376..441D, doi:10.1051/0004-6361:20011021.
Bayer, C.; et al. (November 2000), "CCD photometric search for peculiar stars in open clusters. I. NGC 2169, Melotte 105 and NGC 6250", Astronomy and Astrophysics Supplement, 147: 99–109, Bibcode:2000A&AS..147...99B, doi:10.1051/aas:2000294.
McSwain, M. Virginia; Gies, Douglas R. (November 2005), "The Evolutionary Status of Be Stars: Results from a Photometric Study of Southern Open Clusters", The Astrophysical Journal Supplement Series, 161 (1): 118–146, arXiv:astro-ph/0505032, Bibcode:2005ApJS..161..118M, doi:10.1086/432757.
Herbst, W. (November 1977), "Extinction law in dust clouds and the young southern cluster NGC 6250: further evidence for high values of R", Astronomical Journal, 82: 902–907, Bibcode:1977AJ.....82..902H, doi:10.1086/112144.