@misc{indiciae4909e585e609,
  title = {A simple calculator of ballistic trajectories for blocks ejected during volcanic eruptions},
  author = {Larry G. Mastin},
  year = {2001},
  doi = {10.3133/ofr0145},
  url = {https://pubs.usgs.gov/publication/ofr0145},
  note = {Source identifier: ofr0145}
}