Characterization of isomers of oleuropein aglycon in olive oils by rapid-resolution liquid chromatography coupled to electrospray time-of-flight and ion trap tandem mass spectrometry - Fu, S; Arraez-Roman, D; Menendez, J A; Segura-Carretero, A; Fernandez-Gutierrez, A (Rapid Commun Mass Spectrom, 2009)