TRANSMISSION OF BALLISTIC LONGITUDINAL AND TRANSVERSAL PHONON PULSES THROUGH A SAPPHIRE-HeII INTERFACE AT T = 0.25 K H. W.M. Salemink, H. van Kempen et P. WiderJ. Phys. Colloques, 39 C6 (1978) C6-326-C6-327DOI: https://doi.org/10.1051/jphyscol:19786144
