1. History of Vitamin B12: Pernicious Anemia to Crystalline Cyanocobalamin;Folkers,1982
2. New and Old Problem in the Structure Analysis of Vitamin B12;Hodgkin,1979
3. Synthetic vitamin B12;Woodward,Germany; 1979
4. Vitamin B12 and B12 Proteins;Kräutler,1998
5. Chemistry and Biochemistry of B12;Hogenkamp,1999