@misc{indiciae40c6020329ed,
  title = {Ionospheric heating at Arecibo - First tests.},
  author = {Gordon, W. E. and Showen, R. and Carlson, H. C.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19720027244},
  note = {Source identifier: 19720027244}
}