TY - RPRT TI - Solid-phase extraction with supercritical fluid elution as a sample preparation technique for the ultratrace analysis of flavone in blood plasma. AU - H Liu AU - K R Wehmeyer PY - 1992 DO - 10.1016/0378-4347(92)80598-k UR - https://pubmed.ncbi.nlm.nih.gov/1400746/ ID - 1400746 ER -