@misc{indiciae5204bb81b7ff,
  title = {Trellis coding with multidimensional QAM signal sets},
  author = {Pietrobon, Steven S. and Costello, Daniel J.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930054222},
  note = {Source identifier: 19930054222}
}