@misc{indiciae5ad8a0129003,
  title = {Project Echo: Antenna Steering System},
  author = {Klahn, R. and Norton, J. A. and Githens, J. A.},
  year = {1961},
  url = {https://ntrs.nasa.gov/citations/19980227961},
  note = {Source identifier: 19980227961}
}