JETP, Vol. 43,
No. 2,
p. 317 (February 1976)
(Russian original - ZhETF,
Vol. 70,
No. 2,
p. 610,
February 1976
)
Vibrational spectrum of a crystal with impurities in the presence of localized states near the band edge
M.A. Ivanov, Yu. G. Pogorelov, M.N. Botvinko
Received: July 7, 1975
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