@misc{indiciae4ed736a0a94b,
  title = {Testing the physical parameters of short baseline tiltmeters intended for earthquake prediction},
  author = {M. J. Johnston},
  year = {1976},
  doi = {10.3133/ofr76556},
  url = {https://pubs.usgs.gov/publication/ofr76556},
  note = {Source identifier: ofr76556}
}