1. Zeynek, R., Noviny Lekarskie, Poznan, 38, 406 (1926).
2. Haurowitz, F., “Hæmoglobin, a Symposium in Memory or Sir Joseph Barcroft”, 53 (Butterworth, London, 1949).
3. Haurowitz, F., J. Biol. Chem., 193, 443 (1951).
4. Keilin, D., and Hartree, E. F., Nature, 164, 254 (1949).
5. Coryell, C. D., Stitt, F., and Pauling, L., J. Amer. Chem. Soc., 59, 633 (1937).