@misc{indiciae5dccc3f6e61e,
  title = {Radio Astronomy},
  author = {Shaffer, R. D. and Wolken, P. R. and Niell, A. E.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19810015463},
  note = {Source identifier: 19810015463}
}