1. E. Fujisawa et al, US Patent 6,509,470 (January 29, 2003)
2. Mechanism of acid-catalyzed anomerization of methyl D-glucopyranosides
3. M. Winter et al, US Patent 3,702,253 (November 7, 1972)
4. W.-G. Friebe et al, US Patent 5,399,575 (March 21, 1995)
5. G.M. Dull et al, US Patent 5,616,716 (April 1, 1997);