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\bibitem{Martin_etal1992} {\textquotedblleft}\textit{On the structure, stability and infrared spectrum of B$_{2}$N, B$_{2}$N$^{+}$, B$_{2}$N$^{-}$, BO, B$_{2}$O and B$_{2}$N$_{2}$}{\textquotedblright}. Martin JML, Fran{\c c}ois JP, Gijbels R, Chemical physics letters \textbf{193}, 243 (1992).   http://doi.org/10.1016/0009-2614(92)85662-T

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