TY  - RPRT
TI  - Computational methods for inverse problems in geophysics: Inversion of travel time observations
AU  - V. Pereyra
AU  - H.B. Keller
AU  - W.H.K. Lee
PY  - 1980
DO  - 10.1016/0031-9201(80)90063-1
UR  - https://pubs.usgs.gov/publication/70012330
ID  - 70012330
ER  -