@misc{indiciae1869895e8288,
  title = {Tracking analysis of a first order phase- locked loop with two sinewaves modulation},
  author = {Lee, S. Y. and Nelson, L. D.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710007998},
  note = {Source identifier: 19710007998}
}