MATTSON, Don A. A Note on Equimorphisms of Proximity Spaces. Mathematica Scandinavica, Berkeley, CA, United States, v. 22, p. 143–144, 1968. DOI: 10.7146/math.scand.a-10878. Disponível em: https://journals.msp.org/mscand/article/view/2423. Acesso em: 25 jul. 2026.