TY  - RPRT
TI  - Stress changes ahead of an advancing tunnel
AU  - J.F. Abel
AU  - F. T. Lee
PY  - 1973
DO  - 10.1016/0148-9062(73)90013-2
UR  - https://pubs.usgs.gov/publication/70010168
ID  - 70010168
ER  -