1. Schooley, J. C., Bryant, B. J., and Kelly, L. S., in The Kinetics of Cellular Proliferation, edit. by Stohlman, F., 208 (Grune and Stratton, New York, 1959).
2. Hill, M., Exp. Cell Res., 28, 21 (1962).
3. Yoffey, J. M., Reinhardt, W. O., and Everett, N. B., J. Anat., 95, 293 (1961).
4. Everett, N. B., Rieke, W. O., Reinhardt, W. D., and Yoffey, J. M., in Ciba Found. Symp. Haemopoiesis, edit. by Wolstenholme, G. E. W., and O'Connor, Maeve, 43 (Churchill, London, 1960).
5. Diderholm, H., Acta Path. et Microbiol. Scand., 51 (Suppl. 146) (1961).