[1]
A. S. Lavrent'ev and Y. S. Mishura, “The problem of extension for two-parameter kernels”, Ukr. Mat. Zhurn., vol. 49, no. 9, pp. 1206–1212, Sep. 1997, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5119