@misc{indiciaee912f51b5e7e,
  title = {The Helmholtz-Kirchhoff integral relation as a framework for developing algorithms for sound propagation through inhomogeneous moving media},
  author = {Pierce, Allan D.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19890065947},
  note = {Source identifier: 19890065947}
}