1. Zero-Phonon lines;Sild,1988
2. Absorption Bands and Lines in Irradiated LiF
3. Physics of Color Centers;Fitchen,1968
4. Defects and Defects Process in Nonmetallic Solids;Hayes,1985
5. Abstracts Int. Conf. on Defects in Insulating Crystals;Gellermann,1984