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[文献書誌] Kokubugata, G., K.D.Hill, K.Kondo: "Chromosomal characters of two species of Cycas (Cycadaceae, Cycadales)"Annals of Tsukuba Botanical Garden. 21. 139-141 (2002)
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[文献書誌] 國府方吾郎, Ken D.Hill, 近藤勝彦, 小西達夫: "Cycas属(ソテツ科)11種の染色体数と核型"財団法人染色体学会第53回大会要旨集. 37 (2002)
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[文献書誌] 國府方吾郎, Ken D.Hill, 近藤勝彦: "ソテツ属8種における染色体上5S ribosomal DNA部位の比較"植物分類学会第2回神戸大会要旨集. 60 (2003)
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[文献書誌] Kokubugata, G., K.D.Hill, K.Kondo: "Comparison of 5S ribosomal DNA sites on somatic chromosomes of eight species in Cycas (Cycadaceae)"Chromosome Science. 7(印刷中). (2003)