@misc{indiciae916ab9bbc939,
  title = {A simple antenna with good circular polarization.},
  author = {Levenson, M. M. and Mailloux, R. J. and Van Atta, L. C.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690063601},
  note = {Source identifier: 19690063601}
}