PADMANABHAN, A. R.; RAO, B. V. Ideals in the Lattice of Topologies. The Journal of the Indian Mathematical Society, [S. l.], v. 33, n. 1, p. 65–72, 1969. DOI: 10.18311/jims/1969/16746. Disponível em: https://informaticsjournals.com/index.php/jims/article/view/16746. Acesso em: 2 may. 2024.