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Dréau, A.; Lesik, M.; Rondin, L.; Spinicelli, P.; Arcizet, O.; Roch, J.-F.; Jacques, V. . (2011). Avoiding power broadening in optically detected magnetic resonance of single NV defects for enhanced dc magnetic field sensitivity. Physical Review B, 84(19), 195204–. doi:10.1103/PhysRevB.84.195204 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research