V. S. Korolyuk and Y. V. . Borovskikh, “Asymptotic theory of $U$-statistics”, Ukr. Mat. Zhurn., vol. 40, no. 2, pp. 169–182, Feb. 1988, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/9113