Croom, S. M., Shanks, T., Boyle, B., Smith, R., Miller, L., Loaring, N., & Hoyle, F. (2001). The 2dF QSO Redshift Survey - II. Structure and evolution at high redshift. Monthly Notices of the Royal Astronomical Society, 325, 483-496. https://doi.org/10.1046/j.1365-8711.2001.04389.x