KOROLYUK , V. S.; BOROVSKIKH , Yu. V. Asymptotic theory of $U$-statistics. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 40, n. 2, p. 169–182, 1988. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9113. Acesso em: 6 dec. 2025.