@misc{indiciaeff7ea94bcfb7,
  title = {Preliminary results from comparisons of redundant tiltmeters at three sites in central California},
  author = {C.E. Mortensen and M.J.S. Johnston},
  year = {1979},
  doi = {10.1016/0040-1951(79)90208-7},
  url = {https://pubs.usgs.gov/publication/70010397},
  note = {Source identifier: 70010397}
}