TY  - RPRT
TI  - HYPOELLIPSE: A computer program for determining local earthquake hypocentral parameters, magnitude, and first motion pattern
AU  - John C. Lahr
PY  - 1979
DO  - 10.3133/ofr79431
UR  - https://pubs.usgs.gov/publication/ofr79431
ID  - ofr79431
ER  -