@misc{indiciaec77f8dbf370a,
  title = {Digital second-order phase-locked loop},
  author = {Holmes, J. K. and Carl, C. C. and Tagnelia, C. R.},
  year = {1975},
  url = {https://ntrs.nasa.gov/citations/19740000274},
  note = {Source identifier: 19740000274}
}