@misc{indiciaebd3348bf660f,
  title = {Phase-shift data transmission system having a pseudo-noise SYNC code modulated with the data in a single channel Patent},
  author = {Springett, J. C.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19700032645},
  note = {Source identifier: 19700032645}
}