@article {216,
	title = {Theory of Spin-Conserving Excitation of the N-V Center in Diamond},
	journal = {Phys. Rev. Lett.},
	volume = {103},
	year = {2009},
	pages = {186404},
	author = {A. Gali and E. Janzen and P. Deak and G. Kresse and E. Kaxiras}
}
