Furness, J. P.; Crowther, P. A.; Morris, P. W.; Barbosa, C. L.; Blum, R. D.; Conti, P. S.; van Dyk, S. D. «Mid-infrared diagnostics of metal-rich HII regions from VLT and Spitzer spectroscopy of young massive stars in W31». Monthly Notices of the Royal Astronomical Society, 403, 3, 2010, pàg. 1433-1447. Bibcode: 2010MNRAS.403.1433F. DOI: 10.1111/j.1365-2966.2010.16206.x.
Corbel, S.; Eikenberry, S. S. «The connection between W31, SGR 1806-20, and LBV 1806-20: Distance, extinction, and structure». Astronomy & Astrophysics, 419, 2004, pàg. 191-201. Bibcode: 2004A&A...419..191C. DOI: 10.1111/j.1365-2966.2010.16206.x.
Furness, J. P.; Crowther, P. A.; Morris, P. W.; Barbosa, C. L.; Blum, R. D.; Conti, P. S.; van Dyk, S. D. «Mid-infrared diagnostics of metal-rich HII regions from VLT and Spitzer spectroscopy of young massive stars in W31». Monthly Notices of the Royal Astronomical Society, 403, 3, 2010, pàg. 1433-1447. Bibcode: 2010MNRAS.403.1433F. DOI: 10.1111/j.1365-2966.2010.16206.x.
Corbel, S.; Eikenberry, S. S. «The connection between W31, SGR 1806-20, and LBV 1806-20: Distance, extinction, and structure». Astronomy & Astrophysics, 419, 2004, pàg. 191-201. Bibcode: 2004A&A...419..191C. DOI: 10.1111/j.1365-2966.2010.16206.x.