Scalar perturbations in f(T) gravity using the covariant approachShambel Sahlu, Joseph Ntahompagaze, Amare Abebe, Álvaro de la Cruz-Dombriz and David F. MotaEur. Phys. J. C, 80 5 (2020) 422DOI: https://doi.org/10.1140/epjc/s10052-020-7961-3