ZATORSKY, R.A.; MALARCHUK, A.R. Factorial powers and triangular matrices. Carpathian Mathematical Publications, [S. l.], v. 1, n. 2, p. 161–171, 2009. Disponível em: https://journals.pnu.edu.ua/index.php/cmp/article/view/4011. Acesso em: 18 apr. 2024.