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\bibitem{Afonso_etal2018} Afonso, V. I., Olmo, G. J., Orazi, E., \& Rubiera-Garcia, D. (2018). Mapping nonlinear gravity into General Relativity with nonlinear electrodynamics. \textit{Eur. Phys. J. C}, \textit{78}(10), 866--11pp.

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