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[文献書誌] Hideo Nakaya & Mahito Watabe: "Hipparion from the upper Miocene Namurangule Formation,Samburu Hills,Kenya:phylogenetic significance of newly discovered skull" Geobios. 23. 195-219 (1990)
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[文献書誌] 仲谷 英夫,藤本 満士: "ウシ科(哺乳類,偶蹄目)の角の形態解析" 地球科学. 44. 196-204 (1990)
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[文献書誌] 仲谷 英夫: "オオツノシカから見た大型哺乳動物研究" モンゴロイド. 9. (1991)
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[文献書誌] Mahito Watabe,Hideo Nakaya: "Cranial skeleton of Hipparion (Perissodactyla,Mammalia) from Maragheh (Turolian,late Miocene),Northern Iran." Mem.Fac.Sci.,Kyoto Univ.,Geol.Min.55. (1991)
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[文献書誌] Mahito Watabe,Hideo Nakaya: "Phylogenetic significance of the postcranial skeletons of the hipparions from Maragheh (late Mocene,Northen Iran)." Mem.Fac.Sci.,Kyoto Univ.,Geol.Min.55. (1991)