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[文献書誌] 渡部剛: J.Math.Soc.Japan. 40. 629-645 (1988)
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[文献書誌] 斉藤和夫: Sic.Rep.of Niigata Uiniversity. 24. 13-23 (1988)
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[文献書誌] 関川浩永: Ann.Mat.para Appl.
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[文献書誌] 関川浩永: Casopis Pest.Mat.
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[文献書誌] 印南信宏: Sci,Rep of Niigata University.
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[文献書誌] 印南信宏: Kodai Math J.11. 17-24 (1988)
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[文献書誌] 渡辺誠治: Porc.A.M.S.102. 840-842 (1988)
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[文献書誌] Paul S.Muhly: Annals of Math.127. 245-278 (1988)
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[文献書誌] Paul S.Muhly: Pacific J.Math.
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[文献書誌] 渡辺恵一: Math,Proc.Camb.Phil.SOC,. 103. 503-509 (1988)
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[文献書誌] 渡辺恵一: Sci,Rep.Niigata University.