MATTSON, Don A. A Note on Equimorphisms of Proximity Spaces. MATHEMATICA SCANDINAVICA, [S. l.], v. 22, p. 143–144, 1968. DOI: 10.7146/math.scand.a-10878. Disponível em: https://tidsskrift.dk/math/article/view/10878. Acesso em: 14 aug. 2026.