@article {Xu1993, title = {Electronic, optical, and structural properties of some wurtzite crystals}, journal = {Physical Review B}, volume = {48}, year = {1993}, month = {Jan-08-1993}, pages = {4335 - 4351}, issn = {0163-1829}, doi = {10.1103/PhysRevB.48.4335}, url = {http://link.aps.org/doi/10.1103/PhysRevB.48.4335}, author = {Xu, Yong-Nian and Ching, W.} }