N.V. Kononets, V.V. Seminko, P.O. Maksimchuk, I.I. Bespalova, V.K. Klochkov, and Yu.V. Malyukin, Energy migration processes in phosphate nanocrystals: size and dimensionality dependence: Низкотемпературная оптическая спектроскопия, Low Temp. Phys. 44, (2018) [Fiz. Nizk. Temp. 44, 573-579, (2018)] DOI: https://doi.org/10.1063/1.5034156.