Causal Gödel-type metrics in non-local gravity theories J. R. Nascimento, A. Yu. Petrov and P. J. Porfírio Eur. Phys. J. C, 81 9 (2021) 815 Published online: 15 September 2021 DOI: 10.1140/epjc/s10052-021-09640-5