@misc{indiciae80e1f38746e8,
  title = {A satellite-based digital data system for low-frequency geophysical data},
  author = {S. Silverman and C. Mortensen and M. Johnston},
  year = {1989},
  doi = {10.1785/bssa0790010189},
  url = {https://pubs.usgs.gov/publication/70015099},
  note = {Source identifier: 70015099}
}