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\bibitem{Mauro_etal2015} Mauro, S., Balbinot, R., Fabbri, A., \& Shapiro, I. L. (2015). Fourth derivative gravity in the auxiliary fields representation and application to the black-hole stability. \textit{Eur. Phys. J. Plus}, \textit{130}(7), 135--8pp.

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