@misc{indiciae205998e89e37,
  title = {PiFEx propagation experiments},
  author = {Emerson, Richard F. and Berner, Jeff B. and Ho, Loretta L. G.},
  year = {1988},
  url = {https://ntrs.nasa.gov/citations/19890001704},
  note = {Source identifier: 19890001704}
}