O. V. Ivashchuk, P. V. Zaderei, and E. N. Pelagenko, “On Sidon-Telyakovskii-type conditions for the integrability of multiple trigonometric series”, Ukr. Mat. Zhurn., vol. 60, no. 5, pp. 579–585, May 2008, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3177