LUO, Q.-M. An explicit formula for the Euler numbers of higher order. Tamkang Journal of Mathematics, [S. l.], v. 36, n. 4, p. 315-317, 2005. DOI: 10.5556/j.tkjm.36.2005.103. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/103. Acesso em: 26 may. 2022.