SANKER, D. The converse to Alexandre Froda’s irrationality criterion. MATHEMATICA SCANDINAVICA, [S. l.], v. 68, p. 5–18, 1991. DOI: 10.7146/math.scand.a-12341. Disponível em: https://www.mscand.dk/article/view/12341. Acesso em: 28 apr. 2024.