1. Farber, S., Diamond, L. K., Mercer, R. D., Sylvester, R. F., and Wolff, J. A., New England J. Med., 238, 787 (1948).
2. Kidder, G. W., Dewey, V. C., Parks, jun., R. E., and Woodside, G. L., Science, 109, 511 (1949); Cancer Research, 11, 204 (1951) Hitchings, G. H., “Antimetabolites and Cancer”, 231, edit. C. P Rhoads (A.A.A.S., 1955).
3. Hakala, M. T., Law, L. W., and Welch, A. D., Proc. Amer. Assoc. Cancer Res., 2 (2), 113 (1956). Heidelberger, C., Chaudhuri, N. K., Danneberg, P., Mooren, D., and Griesbach, L., Nature, 179, 66 (1957).
4. Woolley, D. W., “Antimetabolites and Cancer”, 163, edit. C. P. Rhoads (A.A.A.S. Pub., 1955).
5. Quastel, J. H., and Cantero, A., Nature, 171, 252 (1953).