@misc{indiciae9914f5c97882,
  title = {Project Echo: Horn-Reflector Antenna for Space Communication},
  author = {Crawford, A. B. and Hogg, D. C. and Hunt, L. E.},
  year = {1961},
  url = {https://ntrs.nasa.gov/citations/19980227869},
  note = {Source identifier: 19980227869}
}