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\bibitem{Velusamy_etal2010} Velusamy, T., Langer, W. D., Pineda, J. L., Goldsmith, P. F., Li, D., \& Yorke, H. W. (2010). [CII] observations of H$_{2}$ molecular layers in transition clouds. \textit{Astron. Astrophys.}, \textit{521}, L18.

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