1. A. Villiers, Compt. Rend., 112 (1891) 536.
2. F. Schardinger, Z. Untersuch. NAhr. u. Genussm., 6 (1903) 865.
3. F. Schardinger, Zentr. Bakteriol. Parasiten. Abt. II, 29 (1911) 188.
4. H. Pringsheim, Chemistry of the Saccharides, McGraw-Hill, New York (1932) p. 280.
5. W. J. James, D. French and R. E. Rundle, Acta Crystallograph., 12 (1959) 385.