@misc{indiciae5cfe106f4bbc,
  title = {A variable-step-size robust delta modulator.},
  author = {Song, C. L. and Garodnick, J. and Schilling, D. L.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19720033738},
  note = {Source identifier: 19720033738}
}