ROELOFSEN, F. Free Variable Economy. Proceedings of Sinn und Bedeutung, [S. l.], v. 13, n. 2, p. 415–424, 2019. DOI: 10.18148/sub/2009.v13i2.562. Disponível em: https://ojs.ub.uni-konstanz.de/sub/index.php/sub/article/view/562. Acesso em: 4 feb. 2023.