@misc{indiciaed87222cd1696,
  title = {Engineering calculations for communications systems planning},
  author = {Levis, C. A. and Martin, C. H. and Wang, C. W. and Gonsalvez, D.},
  year = {1982},
  url = {https://ntrs.nasa.gov/citations/19830014223},
  note = {Source identifier: 19830014223}
}