TY  - RPRT
TI  - Solid-phase extraction technique for the analysis of biological samples.
AU  - T R Krishnan
AU  - I Ibraham
PY  - 1994
DO  - 10.1016/0731-7085(94)90001-9
UR  - https://pubmed.ncbi.nlm.nih.gov/8031926/
ID  - 8031926
ER  -