The fundamental theorem of affine geometry. Extracta Mathematicae, [S. l.], v. 38, n. 2, p. 221–235, 2023. DOI: 10.17398/2605-5686.38.2.221. Disponível em: https://revista-em.unex.es/index.php/EM/article/view/2605-5686.38.2.221.. Acesso em: 20 may. 2024.