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

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