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Planta Medica|August 25, 2004
Classification and correlation of St. John's wort extracts by nuclear magnetic resonance spectroscopy, multivariate data analysis and pharmacological activityGudrun Roos, Christoph Röseler, Karin Berger Büter, et al.Journal of Chromatographic Science|August 7, 2004
Thin-layer chromatography and multivariate data analysis of willow bark extractsKim Wuthold, Ines Germann, Gudrun Roos, et al.Pageof 1