@misc{indiciae9c98f4fca292,
  title = {Moment-tensor solutions estimated using optimal filter theory: global seismicity, 1984-1987},
  author = {S.A. Sipkin and R.E. Needham},
  year = {1989},
  doi = {10.1016/0031-9201(89)90114-3},
  url = {https://pubs.usgs.gov/publication/70016106},
  note = {Source identifier: 70016106}
}