1. A COLOR TEST FOR WATER-SOLUBLE B
2. Hager, cited from Witthaus, R. A., and Becker, T. C., Medical jurisprudence, forensic medicine and toxicology, New York, 2nd edition, 1911, iv, 996.
3. Ueber die Einwirkung der salpetrigen Säure auf Phenole
4. Mathews, A. P., Physiological chemistry, New York, 3rd edition, 1921, 147.