ZhETF, Vol. 39,
No. 1,
p. 216 (January 1961)
(English translation - JETP,
Vol. 12,
No. 1,
p. 155,
January 1961
)
The issue content is only available in english translation.
The Problem of the Form of the Spectrum of Elementary Excitations of Liquid Helium II
L.P. Pitaevskii
Received: March 11, 1960
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