@article {1863,
	title = {Decoherence-protected transitions of nitrogen-vacancy centers in 99\% 13C-enriched diamond},
	journal = {arXiv:1506.05484},
	year = {2015},
	month = {06/2015},
	author = {Anna J. Parker and Hai-Jing Wang and Yiran Li and Alexander Pines and Jonathan P. King}
}
