1. Benjamins, C. E. (1936). Acta oto-laryng., (Stockh.), 24, 284.
2. Brunner, H., and Donnelly, W. A. (1947). Plast. Reconstr. Surg., 2,497.
3. Crawford, J. K., and Webster, J. P. (1952). Ibid., 9, 235.
4. Davis, A. D., and Berner, R. E. (1948). Ibid., 3, 345.
5. Furniss, F. W. (1938). J. Laryng., 53, 314.