TY  - RPRT
TI  - Determination of niobium in rocks by an isotope dilution spectrophotometric method
AU  - L. P. Greenland
AU  - E.Y. Campbell
PY  - 1970
DO  - 10.1016/s0003-2670(01)80014-3
UR  - https://pubs.usgs.gov/publication/70009960
ID  - 70009960
ER  -