@misc{indiciae516956d446a5,
  title = {Tree attenuation at 20 GHz: Foliage effects},
  author = {Vogel, Wolfhard J. and Goldhirsh, Julius},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19940010199},
  note = {Source identifier: 19940010199}
}