TY  - RPRT
TI  - BOREHOLE NEUTRON ACTIVATION: THE RARE EARTHS.
AU  - J.L. Mikesell
AU  - F. E. Senftle
PY  - 1987
DO  - 10.1109/23.12664
UR  - https://pubs.usgs.gov/publication/70014632
ID  - 70014632
ER  -