1. Duguid, J. B., J. Path. Bact., 58, 207 (1946).
2. Ratnoff, O. D., in Connective Tissue, Thrombosis and Atherosclerosis, edit. by Page, I. H., 78 (Academic Press, New York, 1959).
3. Ratnoff, O. D., and Rosenblum, J. M., J. Lab. Clin. Med., 50, 941 (1957).
4. Jaques, L. B., in Blood Clotting and Allied Problems, edit. by Flynn, J. E., 42 (Josiah Macy Jr. Found., New York, 1951).
5. Astrup, T., in Connective Tissue, Thrombosis and Atherosclerosis, edit. by Page, I. H., 223 (Academic Press, New York, 1959).