JETP, Vol. 13,
No. 4,
p. 845 (October 1961)
(Russian original - ZhETF,
Vol. 40,
No. 4,
p. 1203,
October 1961
)
Use of Indirect Transitions in Semiconductors for the Determination of States with Negative Absorption Coefficients
N.G. Basov, O.N. Krokhin, Yu. M. Popov
Received: November 25, 1960
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