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Electronic transitions between an inner shell and the virtual outer shells of the ions of the rare earths in crystals
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[4]
HARBOTTLE G, BNLC8 REP
[7]
LEWIS WB, BNLC8 REP
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LEWIS WB, MIT19 TECHN REP
[10]
MCCALLUM KJ, BNLC8 REP