KHOMENKO, N. P.; STROK, V. V. Some combinatorial identities for sums of compositional coefficients . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 23, n. 6, p. 830–837, 1971. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8636. Acesso em: 6 dec. 2025.