AARNES, J. F.; ANDENAES, P. R. On Nets and Filters. MATHEMATICA SCANDINAVICA, [S. l.], v. 31, p. 285–292, 1972. DOI: 10.7146/math.scand.a-11435. Disponível em: https://www.mscand.dk/article/view/11435. Acesso em: 24 nov. 2024.