@misc{indiciae5c78e7100808,
  title = {Vibrophonocardiograph investigation and development study.},
  author = {Barker, P. R. and Celentano, J. T. and Randall, R. L. and Walton, D. M. and Wright, L. N.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670062932},
  note = {Source identifier: 19670062932}
}