R. Karimi, M. Eghbalpour, S. H. Asadpour, S. Batebi, H. Rahimpour Soleimani, “Magnetically dependent optical bistability and multistability in an open diamond nitrogen-vacancy centers”, Pis'ma v Zh. Èksper. Teoret. Fiz., 102:5 (2015), 316–321; JETP Letters, 102:5 (2015), 284–289
