Fabbian, D., Asplund, M., Barklem, P. S., Carlsson, M., & Kiselman, D. (2009). Neutral oxygen spectral line formation revisited with new collisional data: large departures from LTE at low metallicity. Astronomy & Astrophysics, 500(3), 1221-1238. doi:10.1051/0004-6361/200809640.