1. Gavosto, F., Maraini, G., and Pileri, A., Nature, 187, 611 (1960).
2. Gavosto, F., Maraini, G., and Pileri, A., Blood, 16, 1555 (1960).
3. Gavosto, F., Proc. Symp. Tritium in the Phys. and Biol. Sci., 2, 238 (Intern. Atomic Energy Agency, Vienna, 1962).
4. Astaldi, G., and Mauri, C., Rev. Belge Path. et Med. Exp., 23, 69 (1953).
5. Lajtha, L. G., The Kinetics of Cellular Proliferation, 173 (Grune and Stratton, New York, 1959).