@misc{indiciae332192358154,
  title = {Closing the gap between regional and global travel time tomography},
  author = {H. Bijwaard and W. Spakman and E.R. Engdahl},
  year = {1998},
  doi = {10.1029/98jb02467},
  url = {https://pubs.usgs.gov/publication/70020490},
  note = {Source identifier: 70020490}
}