@misc{indiciaee013611127ff,
  title = {Evolution of the December 14, 1989 precursory long-period event swarm at Redoubt volcano, Alaska},
  author = {C.D. Stephens and B. A. Chouet},
  year = {2001},
  doi = {10.1016/s0377-0273(00)00308-5},
  url = {https://pubs.usgs.gov/publication/70023664},
  note = {Source identifier: 70023664}
}