@misc{indiciae6deb90a0cc60,
  title = {Stress changes ahead of an advancing tunnel},
  author = {J.F. Abel and F. T. Lee},
  year = {1973},
  doi = {10.1016/0148-9062(73)90013-2},
  url = {https://pubs.usgs.gov/publication/70010168},
  note = {Source identifier: 70010168}
}