@misc{indiciaeacfb99e64957,
  title = {Medical ultrasonic tomographic system},
  author = {Heyser, R. C. and Lecroissette, D. H. and Nathan, R. and Wilson, R. L.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19780004716},
  note = {Source identifier: 19780004716}
}