@misc{indiciae6bf271fdaaa6,
  title = {Improved modulation and coding methods for space communication systems.},
  author = {Heller, J. A. and Lindsey, W. C.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680054602},
  note = {Source identifier: 19680054602}
}