KEDAR, Y. ’Virtus’ and ’species’ in the Philosophy of Nature of Roger Bacon (c. 1220-1293) . Revista Española de Filosofía Medieval, [S. l.], v. 28, n. 1, p. 43–65, 2022. DOI: 10.21071/refime.v28i1.14031. Disponível em: https://journals.uco.es/refime/article/view/14031. Acesso em: 19 feb. 2025.