Free (rational) derivation. Extracta Mathematicae, [S. l.], v. 36, n. 1, p. 25–50, 2021. DOI: 10.17398/2605-5686.36.1.25. Disponível em: https://revista-em.unex.es/index.php/EM/article/view/2605-5686.36.1.25.. Acesso em: 21 nov. 2024.