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\bibitem{Grinolds_etal2011} Grinolds, M. S., Maletinsky, P., Hong, S., Lukin, M. D., Walsworth, R. L., \& Yacoby, A. (2011). Quantum control of proximal spins using nanoscale magnetic resonance imaging. \textit{Nat. Phys.}, \textit{7}(9), 687--692.

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