Zaporozhets, Dmitry N., Ildar A. Ibragimov, Mikhail A. Lifshits, and Aleksandr I. Nazarov. 2020. “To the History of Saint-Petersburg School of Probability and Statistics. II. Random Processes and Dependent Variables”. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy 5 (3):367-401. https://math-mech-astr-journal.spbu.ru/article/view/8499.