Vector-like quarks at the origin of light quark masses and mixingFrancisco J. Botella, G. C. Branco, Miguel Nebot, M. N. Rebelo and J. I. Silva-MarcosEur. Phys. J. C, 77 6 (2017) 408DOI: https://doi.org/10.1140/epjc/s10052-017-4933-3