Fedele, D., Bruderer, S., Van Dishoeck, E. F., Carr, J., Herczeg, G. J., Salyk, C., et al. (2013). DIGIT survey of far-infrared lines from protoplanetary disks I. [O i], [C ii], OH, H2O, and CH+. Astronomy & Astrophysics, 559: A77, pp. 1-22. doi:10.1051/0004-6361/201321118.