@misc{indiciae9a33cbdb9ec3,
  title = {Global navigation and traffic control using satellites},
  author = {Brandel, D. L. and Engels, P. D. and Keane, L. M. and Waetjen, R. M.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19700024013},
  note = {Source identifier: 19700024013}
}