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\bibitem{Lazarides_etal2019} Lazarides, G., Reig, M., Shafi, Q., Srivastava, R., \& Valle, J. W. F. (2019). Spontaneous Breaking of Lepton Number and the Cosmological Domain Wall Problem. \textit{Phys. Rev. Lett.}, \textit{122}(15), 151301--5pp.

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