@misc{indiciaef75074ed8425,
  title = {Mode Propagation in Nonuniform Circular Ducts with Potential Flow},
  author = {Cho, Y. C. and Ingard, K. U.},
  year = {1982},
  url = {https://ntrs.nasa.gov/citations/19820007008},
  note = {Source identifier: 19820007008}
}