Skorokhod , T. A. “On the Mixed Product of Stochastic Semigroups, Generated by the Wiener Processes”. Ukrains’kyi Matematychnyi Zhurnal 40, no. 4 (June 28, 1988): 535–538. Accessed February 17, 2026. https://umj.imath.kiev.ua/index.php/umj/article/view/9196.