es: An elementary tutorial, Am. J. Phys. 58 (1990) 267-273. Nlontroll E.W. and Shlesinger M.F., Proc. Nut. Acad. Sci. USA 79 (1982) 3380-3383. [6] Risken H., The Fokker-Planck equation: methods of solution and applications, 2nd ed. (Berlin; New York: Springer-Verlag, 1989). [7] Feller W., An introductio