Ferrier Glycosylation Reaction Catalyzed by Bi(OTf)3-Montmorillonite K-10: Efficient Synthesis of 3,4-Unsaturated Sialic Acid Derivatives - Ikeda, Kiyoshi; Ueno, Yayoi; Kitani, Satoru; Nishino, Reiko; Sato, Masayuki (Synlett, 2008)