1. Donohue, J. Structures of the Elements, (Wiley, New York, 1974).
2. Douglas, B. E. & Ho, S.-M. Structure and Chemistry of Crystalline Solids (Springer, New York, 2006).
3. Amberger, E. & Ploog, K. Bildung der Gitter des Reinen Bors. J. Less-Common Metals 23, 31–31 (1971).
4. Will, G. & Ploog, K. Crystal Structure of I-Tetragonal Boron. Nature 251, 406–408 (1974).
5. Oganov, A. R. & Solozhenko, V. L. Boron: a Hunt for Superhard Polymorphs. J. Superhard Mater. 31, 285–291 (2009).