1. Levine, P. H., Horoszewicz, J. S., Grace, jun., J. T., Chai, L. S., Ellison, R. R., and Holland, J. S., Cancer, 20, 1563 (1967).
2. Gross, L., Acta Haematol., 29, 1 (1963). Rauscher, F. J., and Allen, B. V., J. Nat. Cancer Inst., 32, 269 (1964). Buffett, R. F., Grace, jun., J. T., DiBerardino, L. A., and Mirand, E. A., Cancer Res., 26, 364 (1966).
3. Siegler, R., in Experimental Leukemia (edit. by Rich, M. A.), 51 (Appleton-Century-Crofts, New York, 1968).
4. Miller, J. F. A. P., in Advances in Cancer Research, 291 (Academic Press, New York, 1961). Metcalf, D., in Ciba Foundation Symposium: Tumor Viruses of Murine Origin, 233 (Little, Brown and Co., Boston, 1962). Furth, J., Okano, H., and Kunii, A., in The Thymus in Immunology, 597 (Hoeber, New York, 1964). Law, L. W., Cancer Res., 26, 551 (1966); Hays, E. F., ibid., 28, 21 (1968). Metcalf, D., Brit. J. Cancer, 10, 442 (1956). Kaplan, H. S., Cancer Res., 21, 981 (1961).
5. Dunn, T. B., J. Nat. Cancer Inst., 14, 1281 (1954). Rich, M. A., and Siegler, R., Ann. Rev. Microbiol., 21, 529 (1967).