@misc{indiciaef998fc75fe08,
  title = {TDM/FM/FDMA - A modulation technique for multiple-beam satellites which precludes cochannel interference and allows non-uniform geographic distribution of user channels},
  author = {Springett, J. C.},
  year = {1982},
  url = {https://ntrs.nasa.gov/citations/19840032850},
  note = {Source identifier: 19840032850}
}