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- [30] Enantio-Differentiating Hydrogenation of Methyl acetoacetate over Asymmetrically Modified Reduced Nickel Catalysts: The Effects of the Coverage of the Modifiers on the Enantio-Differentiating AbilityCatalysis Letters, 2009, 128 : 413 - 417Tsutomu OsawaMasayuki KitanoTadao HaradaOsamu Takayasu