Wampfler, S. F., Bruderer, S., Kristensen, L. E., Chavarría, L., Bergin, E. A., Benz, A. O., et al. (2011). First hyperfine resolved far-infrared OH spectrum from a star-forming region. Astronomy & Astrophysics, 531: L16, pp. 1-5. doi:10.1051/0004-6361/201116893.