Rudnicki, D., Mrózek, M., Młynarczyk, J. and Gawlik, W. 2013. Microwave spectroscopy for diagnostics of nitrogen vacancy defects in diamond samples. Photonics Letters of Poland. 5, 4 (Dec. 2013), pp. 143–145. DOI:https://doi.org/10.4302/photon. lett. pl.v5i4.463.