ZhETF, Vol. 81,
No. 4,
p. 1508 (October 1981)
(English translation - JETP,
Vol. 54,
No. 4,
p. 800,
October 1981
)
The issue content is only available in english translation.
Optical-absorption tail in polar crystals and the Urbach rule
A.S. loselevich
Received: May 8, 1981
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