Stanzhitskii, A. N. “On Reduction Principle in Stability Theory for Systems With Random Perturbations”.
Ukrains’kyi Matematychnyi Zhurnal
, vol. 53, no. 9, Sept. 2001, pp. 1232-40,
https://umj.imath.kiev.ua/index.php/umj/article/view/4342
.