Steiman-Cameron, T. Y.; Wolfire, M.; Hollenbach, D. (2010). „Cobeand the Galactic Interstellar Medium: Geometry of the Spiral Arms from Fir Cooling Lines“. The Astrophysical Journal. 722 (2): 1460. Bibcode:2010ApJ...722.1460S. doi:10.1088/0004-637X/722/2/1460.
Steiman-Cameron, T. Y.; Wolfire, M.; Hollenbach, D. (2010). „Cobeand the Galactic Interstellar Medium: Geometry of the Spiral Arms from Fir Cooling Lines“. The Astrophysical Journal. 722 (2): 1460. Bibcode:2010ApJ...722.1460S. doi:10.1088/0004-637X/722/2/1460.