@article{salemink_kempen_wider_1978, 
  title={TRANSMISSION OF BALLISTIC LONGITUDINAL AND TRANSVERSAL PHONON PULSES THROUGH A SAPPHIRE-HeII INTERFACE AT T = 0.25 K}, 
  volume={39}, 
  DOI={10.1051/jphyscol:19786144}, 
  number={C6}, 
  publisher={EDP Sciences}, 
  author={Salemink and Kempen and Wider}, 
  year={1978}
  }