Charge transfer transitions in optical spectra of NicMg1–cO oxides - V. N. Churmanov; V. I. Sokolov; V. A. Pustovarov; N. B. Gruzdev; M. A. Ujmin; I. V. Byzov; A. V. Druzhinin; A. V. Korolev; G. A. Kim; A. F. Zatsepin (Low Temperature Physics, 2017)