Non-geostationary satellite orbit communications satellite constellations history

Tom Butash, Peter Garland, Barry G. Evans. Non-geostationary satellite orbit communications satellite constellations history. Int. J. Satellite Communications Networking, 39(1):1-5, 2021. [doi]

@article{ButashGE21,
  title = {Non-geostationary satellite orbit communications satellite constellations history},
  author = {Tom Butash and Peter Garland and Barry G. Evans},
  year = {2021},
  doi = {10.1002/sat.1375},
  url = {https://doi.org/10.1002/sat.1375},
  researchr = {https://researchr.org/publication/ButashGE21},
  cites = {0},
  citedby = {0},
  journal = {Int. J. Satellite Communications Networking},
  volume = {39},
  number = {1},
  pages = {1-5},
}