1. Hauschka, T. S., Grinnel, S. T., Révész, L., and Klein, G., Nat. Cancer Inst., 19, 13 (1957).
2. Lindahl, P. E., Cancer Res., 20, 841 (1960).
3. Klein, E., Kurnick, N. B., and Klein, G., Exp. Cell Res., 1, 127 (1950).
4. Baker, J. R., Quart. J. Micro. Sci., 90, 293 (1949). Chiffele, Th. L., and Putt, F. A., Stain Technol., 26, 51 (1951).
5. Tolnai, S., Scantland, R., and Morgan, J. F., Nature, 193, 591 (1962).