KulinichG. L. “Qualitative Analysis of the Influence of Random Perturbations of ‘white-noise’ Type Applied Along the Vector of Phase Velocity on a Harmonic Oscillator With Friction”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 49, no. 1, Jan. 1997, pp. 35–46, https://umj.imath.kiev.ua/index.php/umj/article/view/4985.