1. Inherited Abnormalities of the Skin and Its Appendages;Cockayne, E.A.,1933
2. Elliot, G. T. (1895). J. cutan. Dis., 13, 10.
3. Engman, M. F. and Mook, W. H. (1906). Ibid., 24, 55.
4. Greenberg, S. I. (1944). Arch. Derm. Syph., Chicago, 49, 333.
5. Kanoky, J. P. and Sutton, R. L. (1910). J. Amer. med. Ass., 54, 1137.