PERFEKT, Karl-Mikael. On M-ideals and o-O type spaces. MATHEMATICA SCANDINAVICA, [S. l.], v. 121, n. 1, p. 151–160, 2017. DOI: 10.7146/math.scand.a-96626. Disponível em: https://tidsskrift.dk/math/article/view/96626. Acesso em: 14 aug. 2026.