TY  - RPRT
TI  - Some natural variations in the relative abundance of copper isotopes
AU  - E. C. Walker
AU  - F. Cuttitta
AU  - F. E. Senftle
PY  - 1958
DO  - 10.1016/0016-7037(58)90056-5
UR  - https://pubs.usgs.gov/publication/70010647
ID  - 70010647
ER  -