TY - RPRT TI - Food matrix reference materials for hydrogen, carbon, nitrogen, oxygen, and sulfur stable isotope-ratio measurements: Collagens, flours, honeys, and vegetable oils AU - Arndt Schimmelmann AU - Haiping Qi AU - Philip J.H. Dunn AU - Federica Camin AU - Luana Bontempo AU - Doris Potocnik AU - Nives Ogrinc AU - Simon Kelly AU - James Carter AU - Aiman Abrahim AU - Lauren T Reid AU - Tyler B. Coplen PY - 2020 DO - 10.1021/acs.jafc.0c02610 UR - https://pubs.usgs.gov/publication/70215392 ID - 70215392 ER -