1. G. K. Batchelor,The Theory of Homogeneous Turbulence(Cambridge University Press, Cambridge, England, 1952). A discussion of the physical context of this initial condition is given in Ref. 5.
2. R. H. Kraichnan, inProceedings of Symposia in Applied Mathematics(American Mathematical Society, Providence, Rhode Island, 1962), Vol. 13, p. 199.