1. T. von Kármán,Collected Works(Butterworth’s Scientific Publications, London, 1956), Vol. 2, p. 1914;
2. also at the Proceedings of the International Congress on Applied Mechanics, Delft (1924).
3. Outline of a theory of turbulent shear flow
4. The structure of isotropic turbulence at very high Reynolds numbers
5. L. I. Schiff,Quantum Mechanics(McGraw-Hill Book Company, Inc., New York, 1955), p. 382.