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Yakuwa, T., Harada, T., Hokkaido University : Department of horticulture, Faculty of Agriculture, Japan, Kasai, N., Araki, H. 1981 Studies of the botanical characteristics of genus Dioscorea, II : on the formation and germination of the seed in Chinese yam (cv. Nagaimo). Journal of the Faculty of Agriculture Hokkaido University, 60(3) .