@misc{indiciae86159b55700c,
  title = {Terrain-Moisture Classification Using GPS Surface-Reflected Signals},
  author = {Grant, Michael S. and Acton, Scott T. and Katzberg, Stephen J.},
  year = {2006},
  url = {https://ntrs.nasa.gov/citations/20080013364},
  note = {Source identifier: 20080013364}
}