@misc{indiciaef4820a9ea720,
  title = {Tracking radar studies of bird migration},
  author = {Williams, T. C. and Williams, J. M. and Teal, J. M. and Kanwisher, J. W.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19720017419},
  note = {Source identifier: 19720017419}
}