@misc{indiciaecaf73580d689,
  title = {A simple dead-reckoning navigational system},
  author = {Walls, B. F. and Mastin, W. C. and Broussard, P., Jr.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19720000408},
  note = {Source identifier: 19720000408}
}