@misc{indiciae8cfe327bc497,
  title = {Geophysical subsurface probing with radio-frequency interferometry},
  author = {Kong, J. A. and Tsang, L. and Simmons, G.},
  year = {1974},
  url = {https://ntrs.nasa.gov/citations/19740053687},
  note = {Source identifier: 19740053687}
}