ChalykhE. V. “On One Generalization of the Langevin Equation With Determinate Modulus of Velocity”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 50, no. 7, July 1998, pp. 1004–1006, https://umj.imath.kiev.ua/index.php/umj/article/view/4882.