MAO, Lixin. Modules with respect to cyclic purity. MATHEMATICA SCANDINAVICA, [S. l.], v. 108, n. 2, p. 177–197, 2011. DOI: 10.7146/math.scand.a-15166. Disponível em: https://tidsskrift.dk/math/article/view/15166. Acesso em: 14 aug. 2026.