Davies, B.; Figer, D. F.; Kudritzki, R. P.; MacKenty, J.; Najarro, F.; Herrero, A. A Massive Cluster of Red Supergiants at the Base of the Scutum‐Crux Arm. The Astrophysical Journal (pdf)使用|format=需要含有|url= (帮助). 2007, 671: 781. Bibcode:2007ApJ...671..781D. arXiv:0708.0821. doi:10.1086/522224.
Negueruela, I.; Marco, A.; González-Fernández, C.; Jiménez-Esteban, F.; Clark, J. S.; Garcia, M.; Solano, E. Red supergiants around the obscured open cluster Stephenson 2. Astronomy & Astrophysics. 2012, 547: A15. Bibcode:2012A&A...547A..15N. arXiv:1208.3282. doi:10.1051/0004-6361/201219540.
Negueruela, I.; Marco, A.; González-Fernández, C.; Jiménez-Esteban, F.; Clark, J. S.; Garcia, M.; Solano, E. Red supergiants around the obscured open cluster Stephenson 2. Astronomy & Astrophysics. 2012, 547: A15. Bibcode:2012A&A...547A..15N. arXiv:1208.3282. doi:10.1051/0004-6361/201219540.
Davies, B.; Figer, D. F.; Kudritzki, R. P.; MacKenty, J.; Najarro, F.; Herrero, A. A Massive Cluster of Red Supergiants at the Base of the Scutum‐Crux Arm. The Astrophysical Journal (pdf)使用|format=需要含有|url= (帮助). 2007, 671: 781. Bibcode:2007ApJ...671..781D. arXiv:0708.0821. doi:10.1086/522224.
Negueruela, I.; Marco, A.; González-Fernández, C.; Jiménez-Esteban, F.; Clark, J. S.; Garcia, M.; Solano, E. Red supergiants around the obscured open cluster Stephenson 2. Astronomy & Astrophysics. 2012, 547: A15. Bibcode:2012A&A...547A..15N. arXiv:1208.3282. doi:10.1051/0004-6361/201219540.
Negueruela, I.; Marco, A.; González-Fernández, C.; Jiménez-Esteban, F.; Clark, J. S.; Garcia, M.; Solano, E. Red supergiants around the obscured open cluster Stephenson 2. Astronomy & Astrophysics. 2012, 547: A15. Bibcode:2012A&A...547A..15N. arXiv:1208.3282. doi:10.1051/0004-6361/201219540.
Davies, B.; Figer, D. F.; Kudritzki, R. P.; MacKenty, J.; Najarro, F.; Herrero, A. A Massive Cluster of Red Supergiants at the Base of the Scutum‐Crux Arm. The Astrophysical Journal (pdf)使用|format=需要含有|url= (帮助). 2007, 671: 781. Bibcode:2007ApJ...671..781D. arXiv:0708.0821. doi:10.1086/522224.
Negueruela, I.; Marco, A.; González-Fernández, C.; Jiménez-Esteban, F.; Clark, J. S.; Garcia, M.; Solano, E. Red supergiants around the obscured open cluster Stephenson 2. Astronomy & Astrophysics. 2012, 547: A15. Bibcode:2012A&A...547A..15N. arXiv:1208.3282. doi:10.1051/0004-6361/201219540.
Negueruela, I.; Marco, A.; González-Fernández, C.; Jiménez-Esteban, F.; Clark, J. S.; Garcia, M.; Solano, E. Red supergiants around the obscured open cluster Stephenson 2. Astronomy & Astrophysics. 2012, 547: A15. Bibcode:2012A&A...547A..15N. arXiv:1208.3282. doi:10.1051/0004-6361/201219540.