H`A, Huy T`ai; KEIPER, Graham; MAHMOOD, Hasan; O’ROURKE, Jonathan L. Density of $f$-ideals and $f$-ideals in mixed small degrees. MATHEMATICA SCANDINAVICA, [S. l.], v. 128, n. 1, 2022. DOI: 10.7146/math.scand.a-129244. Disponível em: https://www.mscand.dk/article/view/129244. Acesso em: 5 dec. 2025.