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\bibitem{Olmo_etal2023} Olmo, G. J., Rosa, J. L., Rubiera-Garcia, D., \& Saez-Chillon Gomez, D. (2023). Shadows and photon rings of regular black holes and geonic horizonless compact objects. \textit{Class. Quantum Gravity}, \textit{40}(17), 174002--37pp.

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