@article {Vazquez1968,
	title = {Electroreflectance Measurements on Mg2Si, Mg2Ge, and Mg2Sn},
	journal = {Physical Review},
	volume = {176},
	year = {1968},
	month = {Jan-12-1968},
	pages = {905 - 908},
	issn = {0031-899X},
	doi = {10.1103/PhysRev.176.905},
	url = {http://link.aps.org/doi/10.1103/PhysRev.176.905},
	author = {Vazquez, F. and Forman, Richard and Cardona, Manuel}
}
