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Fuchs, C.; Spiteller, G., Rapid and easy identification of isomers of cpumaroyl- and caffeoyl-D-quinic acid by gas chromatography/mass spectrometry, J. Mass Spectrom., 1996, 31, 6, 602-608, https://doi.org/10.1002/(SICI)1096-9888(199606)31:6<602::AID-JMS338>3.0.CO;2-9 . [all data]