1. P.H. Damgaard, H. Hüffel, Phys. Rep. 152, 227 (1987)
2. M. Fukushima, Dirichlet forms and Markov processes, North-Holland, Amsterdam (1980)
3. S. Albeverio, J. Brasche, M. Röckner, Dirichlet forms and generalized Schrödinger operators, to appear in Proc. Sønderborg Conf. “Schrödinger operators”, Edts. H. Holden, A. Jensen, Lect. Notes Phys., Springer, Berlin (1989)
4. L. Arnold, Stochastic differential equations: theory and applications, J. Wiley, New York (1974)
5. B. Øksendahl, Stochastic differential equations, Springer, Berlin (1985)