@misc{indiciaecc2fe1bfe7eb,
  title = {An efficient coding system for deep space probes with specific application to Pioneer missions},
  author = {Hofman, L. B. and Lumb, D. R.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670023941},
  note = {Source identifier: 19670023941}
}