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\bibitem{delRio_etal2020} del Rio, A., Sanchis-Gual, N., Mewes, V., Agullo, I., Font, J. A., \& Navarro-Salas, J. (2020). Spontaneous Creation of Circularly Polarized Photons in Chiral Astrophysical Systems. \textit{Phys. Rev. Lett.}, \textit{124}(21), 211301--6pp.

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