@misc{indiciaec9cec8b6e459,
  title = {A robust signalling system for land mobile satellite services},
  author = {Irish, Dale and Shmith, Gary and Hart, Nick and Wines, Marie},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19890018546},
  note = {Source identifier: 19890018546}
}