@misc{indiciae59d91eb83006,
  title = {Sonic Boom Propagation in a Stratified Atmosphere, with Computer Program},
  author = {Haefeli, R. C. and Hayes, W. D. and Kulsrud, H. E.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690013184},
  note = {Source identifier: 19690013184}
}