[1]
S. Y. Khachaturov, “Carleman problem for two pairs of functions in a ring”, Ukr. Mat. Zhurn., vol. 49, no. 5, pp. 662–671, May 1997, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5046