1. E. Wolf:Nuovo Cimento,12, 884 (1954).
2. G. K. Batchelor:The Theory of Homogeneous Turbulence (Cambridge, 1953).
3. H. P. Robertson:Proc. Camb. Phil. Soc.,36, 209 (1940).
4. J. Kampé de Fériet:Introduction to the statistical theory of turbulence-correlation and spectrum, Lecture Series no. 8, Institute for Fluid Dynamics and Applied Mathematics, University of Maryland (1951).
5. The author has just learned of some umpublished studies byG. Hultgren of the California Institute of Tecnology in which this result, equation (27), is derived.