ZhETF, Vol. 70,
No. 2,
p. 738 (February 1976)
(English translation - JETP,
Vol. 43,
No. 2,
p. 382,
February 1976
)
The issue content is only available in english translation.
Weakly bound excitation states in a crystal
L.P. Pitaevskii
Received: October 2, 1975
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