@misc{indiciae4c5880b85e42,
  title = {Tentative method for calculation of the sound field about a source over ground considering diffraction and scattering into shadow zones},
  author = {Pridmore-Brown, David C and Ingard, Uno},
  year = {1956},
  url = {https://ntrs.nasa.gov/citations/19930084502},
  note = {Source identifier: 19930084502}
}