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1. ABSOPTION OF SOUND IN HELIUM II

   mass of the liquid. The non-vanishing terms of the matrix elements for transitions of three phonons ... The non-vanishing matrix elements of the Fourier components'%of the density have, according to (3), the form ... It vanishes when absolute zero is approached. jj 'Ael RDP78-04861A000100030009-1 Sanitized- ADDroved;f ...