Charge-transfer bands in alkaline-earth fluoride crystals doped by Eu3+ or Y b3+ ions
2008 ◽
Vol 146
(9-10)
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pp. 376-379
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2017 ◽
Vol 122
(6)
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pp. 901-905
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1987 ◽
Vol 261
(1-2)
◽
pp. 158-160
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