Mapping nonlinear gravity into General Relativity with nonlinear electrodynamicsVictor I. Afonso, Gonzalo J. Olmo, Emanuele Orazi and Diego Rubiera-GarciaEur. Phys. J. C, 78 10 (2018) 866DOI: https://doi.org/10.1140/epjc/s10052-018-6356-1