@misc{indiciae453e6c200221,
  title = {Method and apparatus for imaging through 3-dimensional tracking of protons},
  author = {Ryan, James M. and Macri, John R. and McConnell, Mark L.},
  year = {2001},
  url = {https://ntrs.nasa.gov/citations/20080004668},
  note = {Source identifier: 20080004668}
}