Viability tests of f(R)-gravity models with Supernovae Type 1A data R. T. Hough, A. Abebe and S. E. S. Ferreira Eur. Phys. J. C, 80 8 (2020) 787 Published online: 28 August 2020 DOI: 10.1140/epjc/s10052-020-8342-7