@misc{indiciaeeb5ddc9f6f56,
  title = {A multiloop generalization of the circle criterion for stability margin analysis},
  author = {Safonov, M. G. and Athans, M.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19790023859},
  note = {Source identifier: 19790023859}
}