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[文献書誌] Yokoyama, J., Fukuda, T., Tsukaya, H.: "Morphological and molecular variation in Mitchella undulata, with special reference to the systematic treatment of the dwarf form from Yakushima"Journal of Plant Research. 116. 309-315 (2003)
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[文献書誌] Fukuda, T., Yokoyama, J., Maki, M.: "Molecular evolution of cycloidea-like genes in Fabaceae"Journal of Molecular Evolution. 57. 588-597 (2003)
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[文献書誌] Yokoyama J.: "Cospeciation of figs and fig-wasps : a case study of endemic species pairs in the Ogasawara Islands."Population Ecology. 45. 249-256 (2003)