@article {Richard2013,
	title = {Oxygen deficient centers in silica: optical properties within many-body perturbation theory},
	journal = {Journal of Physics-condensed Matter},
	volume = {25},
	number = {33},
	year = {2013},
	month = {aug},
	pages = {335502},
	doi = {10.1088/0953-8984/25/33/335502},
	author = {Richard, N. and Martin-Samos, L. and Girard, S. and Ruini, A. and Boukenter, A. and Ouerdane, Y. and Meunier, J. -. P.}
}
