P. O. Maksimchuk, O. G. Viagin, I. I. Bespalova, A. A. Masalov, N. Y. Spivak, and Y. V. Malyukin, “Effect of oxygen nonstoichiometry on the formation of luminescence centers in cerium dioxide nanocrystals”, Bioph. Bull., vol. 1, no. 28, 1.