TY  - RPRT
TI  - Determination of melatonin by GC-MS: problems with solid phase extraction (SPE) columns.
AU  - C R Lee
AU  - H Esnaud
PY  - 1988
DO  - 10.1002/bms.1200151206
UR  - https://pubmed.ncbi.nlm.nih.gov/3416091/
ID  - 3416091
ER  -