Casey, C. M., Chapman, S. C., Daddi, E., Dannerbauer, H., Pope, A., Scott, D., Bertoldi, F., Beswick, R. J., Blain, A. W.,
Cox, P., Genzel, R., Greve, T. R., Ivison, R. J., Muxlow, T. W. B., Neri, R., Omont, A., Smail, I., & Tacconi, L. J. (2009). A search for neutral carbon towards two z= 4.05 submillimetre galaxies, GN 20 and
GN 20.2. Monthly Notices of the Royal Astronomical Society, 400(2),
670-676. doi:10.1111/j.1365-2966.2009.15517.x.