1. M. V. Fok and N. A. Yakunina, ?Influence of crystal-lattice field on the luminescence of europium ions in ZnS crystals,? Kratk. Soobshch. Fiz., No. 6, 9?14 (1980).
2. R. S. Title, ?Paramagnetic resonance of8S7/2 in CdSe and CdTe,? Phys. Rev.,138, No. 2A, A631-A635 (1965); R. S. Title, ?Paramagnetic resonance of Eu2+ in CdSe and CdTe,? Phys. Rev.,133, No. 1A, A198?A202 (1964); P. B. Dorain, ?Electron paramagnetic resonance of europium (II) in single crystals of cadmium sulfide,? Phys. Rev.,120, No. 4, 1190?1192 (1960).
3. A. Hausman, ?Paramagnetic resonance of Gd3+ in ZnO,? Solid State Commun., No. 7, 579?583 (1969).
4. G. E. Arkhangel'skii, N. A. Gorbacheva, and M. V. Fok, ?Influence of lattice structure on luminescence and ESR of zinc sulfide activated by europium,? Zh. Prikl. Spektrosk.,19, 460?463 (1973).
5. A. V. Kovalenko, A. S. Kushnir, I. V. Shtambur, and A. Ya. Yakunin, ?ESR spectra of Gd3+ in ZnS and ZnSe single crystals,? Izv. Vyssh. Uchebn. Zaved., Fiz., No. 4, 89?90 (1980).