@misc{indiciaecfa57df30107,
  title = {Field comparison of shallow seismic sources},
  author = {R. D. Miller and S. E. Pullan and J.S. Waldner and F.P. Haeni},
  year = {1986},
  doi = {10.1190/1.1442061},
  url = {https://pubs.usgs.gov/publication/70206243},
  note = {Source identifier: 70206243}
}