Fluoride crystals and high lying excited states of rare earth ions
2001 ◽
Vol 107
(2)
◽
pp. 235-240
◽
1985 ◽
Vol 46
(C7)
◽
pp. C7-349-C7-355
◽
1990 ◽
Vol 45
(1-6)
◽
pp. 248-250
◽
2007 ◽
Vol 42
(4-5)
◽
pp. 798-802
◽
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