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\bibitem{Mookerjea_etal2010} Mookerjea B, Giesen T, Stutzki J, Cernicharo J, Goicoechea JR, De Luca M, et al. Excitation and abundance of C3 in star forming cores. Herschel/HIFI observations of the sight-lines to W31C and W49N. Astron. Astrophys.. 2010;521:L13.

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