TY  - RPRT
TI  - Closing the gap between regional and global travel time tomography
AU  - H. Bijwaard
AU  - W. Spakman
AU  - E.R. Engdahl
PY  - 1998
DO  - 10.1029/98jb02467
UR  - https://pubs.usgs.gov/publication/70020490
ID  - 70020490
ER  -