Springel, V. Cosmology, MPI for Astrophysics, Max Planck Society;
Nagamine, K., Springel, V., & Hernquist, L. (2004). Abundance of damped Lyman alpha absorbers in cosmological smoothed particle hydrodynamics simulations. Monthly Notices of the Royal Astronomical Society, 348(2), 421-434. doi:10.1111/j.1365-2966.2004.07393.x.