Wiersma, Robert P. C. Cosmology, MPI for Astrophysics, Max Planck Society;
Wiersma, R. P. C., Schaye, J., & Theuns, T. (2011). The effect of variations in the input physics on the cosmic distribution of metals predicted by simulations. Monthly Notices of the Royal Astronomical Society, 415(1), 353-371. doi:10.1111/j.1365-2966.2011.18709.x.