@misc{indiciae8fbd30fff9a5,
  title = {Time-to-failure analysis of seismicity preceding the 1989 Loma Prieta earthquake},
  author = {C. G. Bufe and D. J. Varnes},
  year = {1990},
  doi = {10.3133/ofr90666},
  url = {https://pubs.usgs.gov/publication/ofr90666},
  note = {Source identifier: ofr90666}
}