First principles calculations for band-gap energy properties of non-polar and semi-polar ternary nitride alloys under in-plane strainHan Yan, Sheng Liu, Rongjun Zhang, Pei Wang and Zhiyin GanEur. Phys. J. B, 86 2 (2013) 64DOI: https://doi.org/10.1140/epjb/e2012-30742-5