KUHAPATANAKUL, P.; LAOHAKOSOL, V. Irrationality of some Series with Rational Terms. Agriculture and Natural Resources, Bangkok, Thailand, v. 35, n. 2, p. 205–209, 2001. Disponível em: https://li01.tci-thaijo.org/index.php/anres/article/view/240306. Acesso em: 11 oct. 2026.