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Sommer A, Geist B, Da Ines O, Gehwolf R, Schäffner AR, Obermeyer G.Sommer A, et al. Among authors: obermeyer g.New Phytol. 2008;180(4):787-97. doi: 10.1111/j.1469-8137.2008.02607.x. Epub 2008 Aug 25.New Phytol. 2008.PMID: 18761636Free PMC article.