SHI, Xiao-Ting; LIU, Fang-Fang; QI, Feng. An integral representation of the Catalan numbers. Global Journal of Mathematical Analysis, [S. l.], v. 3, n. 3, p. 130–133, 2015. DOI: 10.14419/gjma.v3i3.5055. Disponível em: https://sciencepubco.com/index.php/GJMA/article/view/5055.. Acesso em: 28 apr. 2025.