LANGAN, C. The Metaformal System: Completing the Theory of Language. Cosmos and History: The Journal of Natural and Social Philosophy, [S. l.], v. 14, n. 2, p. 207–227, 2018. Disponível em: https://cosmosandhistory.org/index.php/journal/article/view/740. Acesso em: 21 jan. 2022.