TY  - RPRT
TI  - Critically refracted waves in a spherically symmetric radially heterogeneous Earth model
AU  - David P. Hill
PY  - 1973
DO  - 10.1111/j.1365-246x.1973.tb02390.x
UR  - https://pubs.usgs.gov/publication/70241580
ID  - 70241580
ER  -