Werheit, H., Filipov, V., Kuhlmann, U., Schwarz, U., Armbrüster, M., & Antadze, M. (2012). Isotopic phonon effects in β-rhombohedral boron—non-statistical isotope distribution. Journal of Physics: Condensed Matter, 24(17): 175401, pp. 175401-1-175401-12. doi:10.1088/0953-8984/24/17/175401.