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M Nakayama, MS Roh, K Uchida, Y Yamaguchi, K Takano, M Koshioka: Malvidin 3-rutinoside as the pigment responsible for bract color in Curcuma alismatifolia. In: Bioscience, Biotechnology, and Biochemistry. 64. Jahrgang, Nr.5, 2000, S.1093–5, doi:10.1271/bbb.64.1093, PMID 10879491.