Citation: B. Schulze et al., MODE OF TRANSFORMATION OF [1-N-15]5-HYDROXYBENZIMIDAZOLE AND [1-N-15]5-HYDROXY-6-METHYLBENZIMIDAZOLE INTO THE 5,6-DIMETHYLBENZIMIDAZOLE MOIETY OF VITAMIN-B-12, Biological chemistry Hoppe-Seyler, 375(11), 1994, pp. 785-788