TY  - RPRT
TI  - Calculation of zero-offset vertical seismic profiles generated by a horizontal point force acting on the surface of an elastic half-space
AU  - Hsi-Ping Liu
PY  - 1990
DO  - 10.1785/bssa0800040832
UR  - https://pubs.usgs.gov/publication/70016060
ID  - 70016060
ER  -