1. Spectroscopic Properties of Rare Earths in Optical Materials,2010
2. Nanophotonics;Prasad,2004
3. Luminescent Materials;Blasse,1994
4. J. Evans-Freeman, P. Goldner, T. Kimura, and P. Ruterana (Eds.), The Proceedings of the European Materials Research Society 2007, Symposium C: Rare Earth Ion Doping for Photonics: materials, mechanisms and devices, See for example Mater. Sci. Eng. B 146 (2008) 1.
5. Lasers and Excited States of Rare Earths;Reisfeld,1977