Gravitational waves in theories with a non-minimal curvature-matter coupling Orfeu Bertolami, Cláudio Gomes and Francisco S. N. Lobo Eur. Phys. J. C, 78 4 (2018) 303 Published online: 18 April 2018 DOI: 10.1140/epjc/s10052-018-5781-5