Kama, M., Bruderer, S., Carney, M., Hogerheijde, M., van Dishoeck, E., Fedele, D., et al. (2016). Observations and modelling of CO and [C i] in protoplanetary disks. First detections of [C i] and constraints on the carbon abundance. Astronomy and Astrophysics, 588: A108, pp. A108. doi:10.1051/0004-6361/201526791.