@misc{indiciae87586c97e7d9,
  title = {Seismic waves generated by sonic booms - A geoacoustical problem.},
  author = {Espinosa, A. F. and Mickey, W. V. and Sierra, P. J.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19690033292},
  note = {Source identifier: 19690033292}
}