@misc{indiciae7531e6ed9b91,
  title = {Multi-level trellis coded modulation and multi-stage decoding},
  author = {Costello, Daniel J., Jr. and Wu, Jiantian and Lin, Shu},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19900016277},
  note = {Source identifier: 19900016277}
}