TY  - RPRT
TI  - Two new organic reference materials for δ13C and δ15N measurements and a new value for the δ13C of NBS 22 oil
AU  - Haiping Qi
AU  - Tyler B. Coplen
AU  - Heike Geilmann
AU  - Willi A. Brand
AU  - J.K. Böhlke
PY  - 2003
DO  - 10.1002/rcm.1219
UR  - https://pubs.usgs.gov/publication/70185128
ID  - 70185128
ER  -