Koval, V. A. “Weak Invariance Principle for Solutions of Stochastic Recurrence Equations in a Banach Space”. Ukrains’kyi Matematychnyi Zhurnal 47, no. 1 (January 25, 1995): 114–117. Accessed April 11, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/5390.