(en) J. B. Harborne; H. S. A. Sherratt (1961). "Plant Polyphenols: 3. Flavonoids in genotypes of Primula sinensis" (PDF). Biochem. J. 78 (2): 298–306, DOI10.1042/bj0780298, PMC 1205266, PMID13711452.
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(en) J. B. Harborne; H. S. A. Sherratt (1961). "Plant Polyphenols: 3. Flavonoids in genotypes of Primula sinensis" (PDF). Biochem. J. 78 (2): 298–306, DOI10.1042/bj0780298, PMC 1205266, PMID13711452.