Testing the scalar sector of the standard-model extension with neutron gravity experimentsC. A. Escobar, A. Martín-Ruiz, A. M. Escobar-Ruiz and Román LinaresEur. Phys. J. Plus, 137 10 (2022) 1186DOI: https://doi.org/10.1140/epjp/s13360-022-03412-0