@article {phamenhanced2012, title = {Enhanced metrology using preferential orientation of nitrogen-vacancy centers in diamond}, journal = {Physical Review B}, volume = {86}, year = {2012}, publisher = {{APS}}, author = {Pham, L and Bar-Gill, N and Le Sage, D and Belthangady, C and Stacey, A and Markham, M and Twitchen, D and Lukin, M and Walsworth, R} }