N. I. Portenko, “A Probabilistic Representation for the Solution of One Problem of Mathematical Physics”, Ukr. Mat. Zhurn., vol. 52, no. 9, pp. 1272–1282, Sep. 2000, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4534