@misc{indiciaee79936917196,
  title = {Interplex modulation and a suppressed-carrier tracking loop for coherent communications systems},
  author = {Butman, S. and Timor, U.},
  year = {1974},
  url = {https://ntrs.nasa.gov/citations/19740000209},
  note = {Source identifier: 19740000209}
}