1. Aarseth, S.: Nord. Med. (Schwed.)29, 485 (1946).
2. Aikawa, J. K., C. M. Gillikin, E. G. Herndon, jr. andG. T. Harrel: South. med. J. (Am.)40, 141 (1947).
3. Alexander, H. E. andG. Leidy: J. exper. Med. (Am.)85, 329 (1947).
4. Baggenstoss, A. H., W. H. Feldman andH. C. Hinshaw: Amer. Rev. Tbc.55, 54 (1947).
5. Bergstrom, S., H. Theorell andH. Davide: Arch. Biochem.10, 165 (1946).