@misc{indiciae2494b00ba7ad,
  title = {LIBRA: An inexpensive geodetic network densification system},
  author = {Fliegel, H. F. and Gantsweg, M. and Callahan, P. S.},
  year = {1975},
  url = {https://ntrs.nasa.gov/citations/19750023106},
  note = {Source identifier: 19750023106}
}