“On the Numerical Solution of the Focker - Planck - Kolmogorov Equation for a Differential-Difference Equation of the Second Order With Random Deviations of an Argument”. Neliniini Kolyvannya, vol. 2, no. 4, Dec. 1999, pp. 501-10, https://twinhead.imath.kiev.ua/index.php/nosc/article/view/83.