TY  - RPRT
TI  - Determination of submicrogram-per-liter concentrations of caffeine in surface water and groundwater samples by solid-phase extraction and liquid chromatography
AU  - M.R. Burkhardt
AU  - P.P. Soliven
AU  - S.L. Werner
AU  - D.G. Vaught
PY  - 2020
DO  - 10.1093/jaoac/82.1.161
UR  - https://pubs.usgs.gov/publication/70022012
ID  - 70022012
ER  -