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\bibitem{Caputo_etal2020} Caputo, A., Esposito, A., Geoffray, E., Polosa, A. D., \& Sun, S. C. (2020). Dark matter, dark photon and superfluid He-4 from effective field theory. \textit{Phys. Lett. B}, \textit{802}, 135258--6pp.

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