MAGNUS, R. A splitting lemma for non-reflexive Banach spaces. MATHEMATICA SCANDINAVICA, [S. l.], v. 46, p. 118–128, 1980. DOI: 10.7146/math.scand.a-11856. Disponível em: https://www.mscand.dk/article/view/11856. Acesso em: 11 apr. 2025.