@misc{indiciaec07695fcea40,
  title = {Non-linear propagation in near sonic flows},
  author = {Nayfeh, A. H. and Kelly, J. J. and Watson, L. T.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19810047239},
  note = {Source identifier: 19810047239}
}