Nagashima, M., Lacey, C., Okamoto, T., Baugh, C., Frenk, C., & Cole, S. (2005). The metal enrichment of elliptical galaxies in hierarchical galaxy formation models. Monthly Notices of the Royal Astronomical Society: Letters, 363(1), L31-L35. https://doi.org/10.1111/j.1745-3933.2005.00078.x