@misc{indiciaeabaea891f510,
  title = {A stability bound for relay control systems in non-phase variable form},
  author = {Goldstein, B. F. and Lindorff, D. P.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700009132},
  note = {Source identifier: 19700009132}
}