1. M. Kac, Proc. Second Berkley Symp. Math. Stat. Prob., 189 (1950)
2. R.P. Feynman, Revx, Mod. Phys. 20, 267 (1948)
3. H.P. McKean and I.M. Singer, J. Diff. Geom. 1, 43 (1967) ibid 5, 233 (1971)
4. A,N. Kolmogorov, Uspekhi Mat. Nauk. 5, 5 (1938)
5. W. Feller, Uspekhi Mat. Nauk. 8, 232 (1940) H.P. McKean, Stochastic Integrals, Academic Press, New York, 1969