1. 1) Baratt, B: ochem. Journal. Vol.23. 1929.
2. 2) Bedson, Brit. Journal of Exp. Pathology. Vol.7. 1926.
3. 3) Elvidge, Joumal of Pathology & Bacteriology. Vol.XXIX, No.4. 1926.
4. 4) Evans & Howell, Amerlcan Joumal of Physiology. Vol.XCVIII. No.1, 1931.
5. 6) Hary, Journal of exp. Medicine. Vol.44. 1926.