Buldygin, V. V., and V. A. Koval. 2000. “On the Asymptotic Properties of Solutions of Linear Stochastic Differential Equations in $R^d$”. Ukrains’kyi Matematychnyi Zhurnal 52 (9), 1166-75. https://umj.imath.kiev.ua/index.php/umj/article/view/4524.