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\bibitem{Martin_etal1995} {\textquotedblleft}\textit{The structure and energetics of B$_{3}$N$_{2}$, B$_{2}$N$_{3}$, and BN$_{4}$: symmetry breaking effects in B$_{3}$N$_{2}$}{\textquotedblright}. Martin JML, El-Yazal J, Fran{\c c}ois JP, Gijbels R, Molecular physics \textbf{85}, 527 (1995).   http://doi.org/10.1080/00268979500101281

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