L.P. Pitaevskiia,b aKapitza Institute of Physical Problems, Russian Academy of Sciences, ul. Kosygina 2, Moscow, 117334, Russian Federation bDipartimento di Fisica, Università di Trento and BDC Center, Povo, Trento, I-38050, Italy
PACS:67.80.Cx DOI:10.1070/PU1968v011n03ABEH003839 URL: https://ufn.ru/en/articles/1968/3/j/ Citation: Pitaevskii L P "Second sound in solids" Sov. Phys. Usp.11 342–344 (1968)