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\bibitem{Capozziello_etal2014} Capozziello, S., Harko, T., Lobo, F. S. N., Olmo, G. J., \& Vignolo, S. (2014). The Cauchy problem in hybrid metric-Palatini f(X)-gravity. \textit{Int. J. Geom. Methods Mod. Phys.}, \textit{11}(5), 1450042--12pp.

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