Goldsmith, P. F., Liseau, R., Bell, T. A., Black, J. H., Chen, J.-H., Hollenbach, D., et al. (2011). Herschel measurements of molecular oxygen in Orion. The Astrophysical Journal, 737(2): 96, pp. 1-17. doi:10.1088/0004-637X/737/2/96.