1. Teed, P. L.: Aeroplane 82, 787 (1952).
2. Forrest, G.: J. Inst. Metals 72, 1–17 (1946); also: J. Roy. aeronaut. Soc. 58, 261–276 (1954).
3. Rosenthal, D., and G. Sines: Proc. ASTM 51, 593–610 (1951) (Discussion by Templin).
4. Kerry, F. A., J. Nichols and K. Vincent: Saunders-Roe Ltd Rep. (England) SR/S/762 (1952).
5. Walker, P. B.: J. Roy. aeronaut. Soc, 57, 12 (1953).