TY  - RPRT
TI  - Preliminary investigations on computational methods for solving the two-point seismic ray-tracing problem in a heterogeneous and isotropic medium
AU  - J.P. Yang
AU  - William Hung Kan Lee
PY  - 1976
DO  - 10.3133/ofr76707
UR  - https://pubs.usgs.gov/publication/ofr76707
ID  - ofr76707
ER  -