Di Matteo, Tiziana High Energy Astrophysics, MPI for Astrophysics, Max Planck Society;
Springel, Volker Cosmology, MPI for Astrophysics, Max Planck Society;
Hopkins, P. F., Hernquist, L., Martini, P., Cox, T. J., Robertson, B., Di Matteo, T., et al. (2005). A physical model for the origin of quasar lifetimes. The Astrophysical Journal, 625(2), L71-L74. doi:10.1086/431146.