McCarthy, P. J. Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society;
Trump, J. R., Impey, C. D., Kelly, B. C., Elvis, M., Merloni, A., Bongiorno, A., et al. (2009). Observational limits on type 1 active galactic nucleus accretion rate in COSMOS. The Astrophysical Journal, 700(1), 49-55. doi:10.1088/0004-637X/700/1/49.