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\bibitem{Martin_etal1995} {\textquotedblleft}\textit{Structures and thermochemistry of B$_{3}$N$_{3}$ and B$_{4}$N$_{4}$}{\textquotedblright}. Martin JML, El-Yazal J, Fran{\c c}ois JP, Gijbels R, Chemical physics letters \textbf{232}, 289 (1995).   http://doi.org/10.1016/0009-2614(94)01336-T

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