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James L. Goatley, Ralph W. Lewis:Composition of Guttation Fluid from Rye, Wheat, and Barley Seedlings. In: Plant Physiology. Band41, Nr.3, März 1966, S.373–375, doi:10.1104/pp.41.3.373, PMID 16656266, PMC1086351(freier Volltext).