TY  - RPRT
TI  - Preparation and stable isotope determination of NBS-16 and NBS-17 carbon dioxide reference samples
AU  - T.B. Coplen
PY  - 2002
DO  - 10.1021/ac00251a050
UR  - https://pubs.usgs.gov/publication/70011437
ID  - 70011437
ER  -