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\bibitem{Sanchis-Lozano+Sanz2024} Sanchis-Lozano, M. A., \& Sanz, V. (2024). Observable imprints of primordial gravitational waves on the temperature anisotropies of the cosmic microwave background. \textit{Phys. Rev. D}, \textit{109}(6), 063529--11pp.

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