@misc{indiciaea9e42d59c2e5,
  title = {Leak detector uses ultrasonics},
  author = {Heisman, R. M. and Iceland, W. F. and Keir, A. R.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19770000409},
  note = {Source identifier: 19770000409}
}