1. Bruce, W. R., Meeker, B. E., and Valeriote, F. A., J. Nat. Cancer Inst., 37, 233 (1966).
2. Skipper, H. E., Cancer, 21, 600 (1968).
3. Ogawa, M., Bergsagel, D. E., and McCulloch, E. A., Blood, 41, 7 (1973).
4. Blackett, N. M., and Adams, K., Brit. J. Haemat., 23, 751 (1972).
5. Valeriote, F. A., and Bruce, W. R., J. Nat. Cancer Inst., 38, 393 (1967).