EISENBERG, M. A Note on Positively Expansive Endomorphisms. MATHEMATICA SCANDINAVICA, [S. l.], v. 19, p. 217–218, 1966. DOI: 10.7146/math.scand.a-10812. Disponível em: https://www.mscand.dk/article/view/10812. Acesso em: 3 jul. 2024.