J. Chang,  Y. Cheng and M. Fu. (2010). First-Principles Calculations of Thermodynamic Properties of Superhard Orthorhombic $\beta-BC_2N$.
            <i>Journal of Atomic and Molecular Sciences</i>. <i>1</i> (3).
            243-252.
         doi:10.4208/jams.012410.031810a