TY  - RPRT
TI  - Microcrack closure in rocks under stress - Direct observation
AU  - Batzle, M. L.
AU  - Simmons, G.
AU  - Siegfried, R. W.
PY  - 1980
UR  - https://ntrs.nasa.gov/citations/19810033737
ID  - 19810033737
ER  -