1. For an extensive review see Monin, A. and Yaglom, A.M.: Statistical Fluid Mechanics, Vol. 2. Cambridge: MIT Press 1975
2. Forster, D., Nelson, D.R., Stephen, M.J.: Phys. Rev. A16, 732 (1977)
3. Lovesey, S.W.: J. Phys. C10, 1781 (1977)
4. Fournier, J.D.: Thesis, University of Nice 1977
5. Lücke, M.: Phys. Rev.A July 1978