JETP, Vol. 12,
No. 5,
p. 1033 (May 1961)
(Russian original - ZhETF,
Vol. 39,
No. 5,
p. 1486,
May 1961
)
Possibility of Using Indirect Transitions to Obtain Negative Temperatures in Semiconductors
N.G. Basov, O.N. Krokhin, Yu. M. Popov
Received: October 3, 1960
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