Benitz-Herrera, S., Röpke, F., Hillebrandt, W., Mignone, C., Bartelmann, M., & Weller, J. (2012). Model-independent reconstruction of the expansion history of the universe from type Ia supernovae. Monthly Notices of the Royal Astronomical Society, 419(1), 513-521. doi:10.1111/j.1365-2966.2011.19716.x.