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\bibitem{DeLuca_etal2012} De Luca, M., Gupta, H., Neufeld, D., Gerin, M., Teyssier, D., Drouin, B. J., et al. (2012). Herschel/HIFI discovery of HCL+ in the interstellar medium. \textit{Astrophys. J. Lett.}, \textit{751}(2), L37.

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