1. Bolland and Koch, J. Chem. Soc., 445 (1945).
2. Bergström, Nature, 156, 717 (1945); Arkiv Kemi, Min.-Geol., 21, A, 14, 15 (1945).
3. Holman, Arch. Biochem., 10, 519 (1946).
4. Theorell, Bergström and Åkesson, Pharm. Acta Helv., 21, 318 (1946).
5. Theorell, Holman and Åkesson, Arch. Biochem., 14, 250 (1947).