1. Arhangelskaya, V.A., 1965. Trapping centres in rare-earth ion activated Ca, Sr and Ba fluoride single crystals. Izvestia Akademii Nauk SSSR, Ser. fiz. vol 29, pp. 454–459, (in Russian).
2. Arhangelskaya, V.A., Shcheulin, A.S., 1981. The mechanism of the MA-centre thermal destruction in fluorite-type crystals. Optika i Spektroskopia. 50, pp. 1142–1146, (in Russian).
3. Hayes, W., Stoneham, A., 1974. in: Hayes, W. (Ed.), Crystals with the Fluoride Structure. Clarendon Press, Oxford, pp. 185–280.
4. Studies of defect clustering in CaF2:Y3+ by ionic conductivity and thermal depolarisation;Jacobs;J. Phys. Chem. Solids,1980
5. Dielectric constant and ITC measurements of BaF2:Dy3+;Jeandel;Phys. Stat. Solidi (a),1988