@article{sizova2017divalent-en, title={Divalent rare-earth ions Pr, Sm, Нo, Er, Tm, and Yb in crystals of alkaline-earth fluorides},
author={Sizova, T Yu and Veslopolova, V Yu and Shendrik, R Yu and Egranov, AV and Radzhabov, EA and Shalaev, AA},
journal={Bulletin of the Russian Academy of Sciences: Physics},
volume={81},
number={9},
pages={1090--1093},
year={2017},
doi={10.3103/S1062873817090234},
webpdf={pdf/sizova2017.pdf}}