@misc{indiciaee975f053653e,
  title = {Calculation of zero-offset vertical seismic profiles generated by a horizontal point force acting on the surface of an elastic half-space},
  author = {Hsi-Ping Liu},
  year = {1990},
  doi = {10.1785/bssa0800040832},
  url = {https://pubs.usgs.gov/publication/70016060},
  note = {Source identifier: 70016060}
}