Shankar, Francesco Cosmology, MPI for Astrophysics, Max Planck Society;
Shankar, F., Weinberg, D. H., & Shen, Y. (2010). Constraints on black hole duty cycles and the black hole-halo relation from SDSS quasar clustering. Monthly Notices of the Royal Astronomical Society, 406(3), 1959-1966. doi:10.1111/j.1365-2966.2010.16801.x.