1. Chernoff, P. R. (1968). Note on product formulas for operator semigroups.J. Funct. Anal. 2, 238?242.
2. Pure and Appl. Math.;N. Dunford,1958
3. Oxford Mathematical Monographs;J. A. Goldstein,1985
4. Ito, K., and McKean, H. P., Jr. (1964).Diffusion Processes and Their Sample Paths. Academic Press, New York.
5. Kac, M. (1951). On some connections between probability theory and differential and integral equations.Proc. Second Berkeley Symposium on Math. Stat. and Probability, pp. 198?215. University of California Press, Berkeley.