INGELSTAM, Lars. Symmetry in Real Banach Spaces. MATHEMATICA SCANDINAVICA, [S. l.], v. 18, p. 53–68, 1966. DOI: 10.7146/math.scand.a-10780. Disponível em: https://tidsskrift.dk/math/article/view/10780. Acesso em: 14 aug. 2026.