JETP, Vol. 42,
No. 3,
p. 525 (October 1975)
(Russian original - ZhETF,
Vol. 69,
No. 3,
p. 1034,
October 1975
)
Exchange mechanism of nonradiative energy transfer between rare-earth ions in crystals
Yu. K. Voron'ko, A.A. Sobol'
Received: April 1, 1975
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