KAIJSER, Sten. A note on dual Banach spaces. MATHEMATICA SCANDINAVICA, [S. l.], v. 41, p. 325–330, 1977. DOI: 10.7146/math.scand.a-11725. Disponível em: https://tidsskrift.dk/math/article/view/11725. Acesso em: 14 aug. 2026.