LIMA, Asvald. Uniqueness of Hahn-Banach extensions and liftings of linear dependences. Mathematica Scandinavica, Berkeley, CA, United States, v. 53, p. 97–113, 1983. DOI: 10.7146/math.scand.a-12019. Disponível em: https://journals.msp.org/mscand/article/view/1647. Acesso em: 25 jul. 2026.