Quantitation of oleuropein and related metabolites in decoctions of Olea europaea leaves from ten Greek cultivated varieties by HPLC with diode array detection (HPLC‐DAD) - Agalias, Apostolis; Eleni Melliou; Prokopios Magiatis; Mitaku, Sofia; Gikas, Evagelos; Tsarbopoulos, Anthony (Journal of Liquid Chromatography and Related Technologies, 2005)