Furness, J. P.; Crowther, P. A.; Morris, P. W.; Barbosa, C. L.; Blum, R. D.; Conti, P. S.; van Dyk, S. D. (2010). «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 Society403 (3): 1433-1447. Bibcode:2010MNRAS.403.1433F. 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. (2010). «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 Society403 (3): 1433-1447. Bibcode:2010MNRAS.403.1433F. doi:10.1111/j.1365-2966.2010.16206.x.