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Sakamaki N., Nakazato M., Matsumoto H., Hagino K., Hirata K., Ushiyama H. Contents of furanocoumarins in grapefruit juice and health foods. Journal of the Food Hygienic Society of Japan. 2008, 49 (4): 326–331. PMID 18787320. doi:10.3358/shokueishi.49.326.