TY  - RPRT
TI  - Improved online δ18O measurements of nitrogen‐ and sulfur‐bearing organic materials and a proposed analytical protocol
AU  - Haiping Qi
AU  - Tyler B. Coplen
AU  - Leonard I Wassenaar
PY  - 2011
DO  - 10.1002/rcm.5088
UR  - https://pubs.usgs.gov/publication/70212846
ID  - 70212846
ER  -