@misc{indiciae19c318b8e450,
  title = {Diffraction of sound by a smooth ridge},
  author = {Berthelot, Yves H. and Pierce, Allan D. and Kearns, James A. and Main, Geoffrey L.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19880052487},
  note = {Source identifier: 19880052487}
}