@misc{indiciae7dbde4ffc31f,
  title = {Very long-period signals associated with vulcanian explosions at Popocatepetl volcano, Mexico},
  author = {A. Arciniega-Ceballos and B. A. Chouet and P. Dawson},
  year = {1999},
  doi = {10.1029/1999gl005390},
  url = {https://pubs.usgs.gov/publication/70021394},
  note = {Source identifier: 70021394}
}