@misc{indiciaea1b3cf042d85,
  title = {A six-channel seismic amplifier},
  author = {E.G. Jensen},
  year = {1990},
  doi = {10.3133/ofr90346},
  url = {https://pubs.usgs.gov/publication/ofr90346},
  note = {Source identifier: ofr90346}
}