TY  - RPRT
TI  - Three new calcium formate reference materials for δ13C measurements and a redetermination of the R(13C/12C) ratio for VPDB based on proton nuclear magnetic resonance measurements
AU  - David W. Hoffman
AU  - Cornelia Rasmussen
AU  - Arndt Schimmelmann
AU  - Lauren T Reid
AU  - Haiping Qi
AU  - Tyler B. Coplen
PY  - 2026
DO  - 10.1002/rcm.70132
UR  - https://pubs.usgs.gov/publication/70277046
ID  - 70277046
ER  -