1. Gaarder, A., Jonsen, J., Laland, S., Hellem, A., and Owren, P. A., Nature, 192, 531–532 (1961).
2. Haut, M. J., Cowan, D. H., and Harris, J. W., J. lab. clin. Med., 82, 44–53 (1973).
3. Peytremann, R., Rhodes, R. S., and Hartmann, R. C., Ser. Haemat., 5, (3), 115–136 (1972).
4. Jorgensen, S., Acta Pharm. Tox. Kbh., 12, 294–302 (1956).
5. Ireland, D. M., and Mills, D. C. B., Biochem. J., 99, 283–296 (1966).