1. Seguira, J. H., Ingram, J. T., and Brain, R. T., in Diseases of the skin, 73 (Macmillan, New York, 1911).
2. McKusick, V. A., Mendelian Inheritance in Man (Johns Hopkins Press, Baltimore, 1966).
3. Rörsch, A., van de Putte, P., Mattern, I. E., and Zwenk, H., in Genetical Aspects of Radiosensitivity: Mechanisms of Repair, 105 (IAEA, Vienna, 1966).
4. Pettijohn, D., and Hanawalt, P. C., J. Mol. Biol., 9, 395 (1964).
5. Setlow, R. B., and Carrier, W. L., Proc. US Nat. Acad. Sci., 51, 226 (1964).