[1] Zorenko Y, Pashkovsky M, Voloshinovskii A. Journal of Lumincscence, 2006, 116(1-2): 43.
[2] Aucedo E S, O Martínez, Ruiz C M. Journal of Crystal Growth, 2006, 291(2): 416.
[4] Khonthon S, Morimoto S, Arai Y. Ceramic Society Jap, 2007, 115(1340): 259.
[5] Okhrimchuk A G, Butvina L N, Dianov E M. Optics Letters, 2008, 33(19): 2182.
[11] Kalinko A, Kuzmin A, Evarestov R A. Solid State Communications, 2009, 149: 425.
[13] Novoselov A, Yoshikawa A, Nikl M. Nuclear Insteuments and Methods in Physics Research A, 2005, 537: 247.
[14] Fujimoto Y. J. Am. Ceram. Soc., 2010, 93(2): 581.
[15] Kumada N, Takahashi N, Kinomura N. Journal of Solid State Chemistry, 1996, 126(1): 121.
[16] Kumada N, Kinomura N, Sleight A W. Solid State Ionics, 1999, 122(1-4): 183.