@misc{indiciaeac6633a2e579,
  title = {Poincare-Lighthill and linear-time-scales methods for linear perturbation problems.},
  author = {Klimas, A. and Murphy, F. X., Jr. and Sandri, G.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730052950},
  note = {Source identifier: 19730052950}
}