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\bibitem{Bambi_etal2016} Bambi, C., Cardenas-Avendano, A., Olmo, G. J., \& Rubiera-Garcia, D. (2016). Wormholes and nonsingular spacetimes in Palatini f(R) gravity. \textit{Phys. Rev. D}, \textit{93}(6), 064016--8pp.

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