Structural, elastic, thermodynamic, electronic, and optical properties of ( and Ga): ab initio investigationY. Medkour, F. Djeghloul, N. Bouarissa and A. RoumiliEur. Phys. J. B, 94 4 (2021) 88DOI: https://doi.org/10.1140/epjb/s10051-021-00090-2