TY  - RPRT
TI  - Comparison of stable isotope reference samples
AU  - Tyler B. Coplen
AU  - Carol Kendall
AU  - Jessica A. Hopple
PY  - 1983
DO  - 10.1038/302236a0
UR  - https://pubs.usgs.gov/publication/70204904
ID  - 70204904
ER  -