Buldygin, V. V., and V. A. Koval. “On the Asymptotic Properties of Solutions of Linear Stochastic Differential Equations in $R^d$”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 52, no. 9, Sept. 2000, pp. 1166-75, https://umj.imath.kiev.ua/index.php/umj/article/view/4524.