V. A. Koval, “Bounded law of the iterated logarithm for multidimensional martingales normalized by matrices”, Ukr. Mat. Zhurn., vol. 58, no. 7, pp. 1006–1008, Jul. 2006, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3510