1. Callomon (1910). Arch. Derm. Syph., Wien, 104, 292.
2. Clouston, H. R. (1929). Canad. med. Ass. J., 21, 18.
3. Inherited Abnormalities of the Skin and its Appendages;Cockayne, E.A.,1933
4. Cockayne, E. A., Krestin, D., and Sorsby, E. (1935). Quart. J. Med., 4, 93.
5. Ellis, R. W. B., Sheldon, W. P., and Capon, N. B. (1936). Ibid., 5, 119.