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\bibitem{Justtanont_etal2010} Justtanont, K., Decin, L., Sch{\"o}ier, F. L., Maercker, M., Olofsson, H., Bujarrabal, V., et al. (2010). A HIFI preview of warm molecular gas around {\"I}{\textdaggerdbl} Cygni: first detection of H2O emission toward an S-type AGB star. \textit{Astron. Astrophys.}, \textit{521}, L6.

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