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- [5] ENERGY LEVELS OF URANIUM IONS IN CALCIUM FLUORIDE CRYSTALS PHYSICAL REVIEW B, 1970, 2 (07): : 2273 - &
- [6] EFFECT OF PRESSURE AND CRYSTAL-STRUCTURE ON ENERGY-LEVELS OF PR3+ IN LACL3 PHYSICAL REVIEW B, 1989, 39 (17): : 12497 - 12519
- [9] Spectroscopic properties of nonstoichiometric multicomponent fluoride crystals with fluorite structure doped with Pr3+ ions Opt Commun, 5-6 (558-567):