PATTEE, H. The Physics of Symbols Evolved Before Consciousness. Cosmos and History: The Journal of Natural and Social Philosophy, [S. l.], v. 11, n. 2, p. 269–277, 2015. Disponível em: https://cosmosandhistory.org/index.php/journal/article/view/498. Acesso em: 27 jan. 2022.