TY  - RPRT
TI  - Double-disk solid-phase extraction--Simultaneous cleanup and trace enrichment of herbicides and metabolites from environmental samples
AU  - Imma Ferrar
AU  - Damia Barcelo
AU  - E.M. Thurman
PY  - 1999
DO  - 10.1021/ac980975q
UR  - https://pubs.usgs.gov/publication/70185250
ID  - 70185250
ER  -