BINGHAM, J. Formalizing a Proof that e is Transcendental. Journal of Formalized Reasoning, [S. l.], v. 4, n. 1, p. 71–84, 2011. DOI: 10.6092/issn.1972-5787/2269. Disponível em: https://jfr.unibo.it/article/view/2269. Acesso em: 29 sep. 2022.