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\bibitem{Martin_etal1991} {\textquotedblleft}\textit{Structure and infrared spectroscopy of the C$_{11}$ molecule}{\textquotedblright}. Martin JML, Fran{\c c}ois JP, Gijbels R, Alml{\"o}f J, Chemical physics letters \textbf{187}, 367 (1991).   http://doi.org/10.1016/0009-2614(91)80267-2

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