@misc{indiciae75a157eaae69,
  title = {Stability of subharmonic oscillations in nonlinear systems.},
  author = {Nicholls, R. E. and Oldenburger, R.},
  year = {1964},
  url = {https://ntrs.nasa.gov/citations/19640029549},
  note = {Source identifier: 19640029549}
}