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\bibitem{Beltran-Palau_etal2020} Beltran-Palau, P., Navarro-Salas, J., \& Pla, S. (2020). Adiabatic regularization for Dirac fields in time-varying electric backgrounds. \textit{Phys. Rev. D}, \textit{101}(10), 105014--15pp.

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