TY  - RPRT
TI  - Moment-tensor solutions estimated using optimal filter theory: global seismicity, 1988-1989
AU  - S.A. Sipkin
AU  - R.E. Needham
PY  - 1991
DO  - 10.1016/0031-9201(91)90019-e
UR  - https://pubs.usgs.gov/publication/70016700
ID  - 70016700
ER  -