BONDER, E. The approximation property for a pair of Banach spaces. MATHEMATICA SCANDINAVICA, [S. l.], v. 57, p. 375–385, 1985. DOI: 10.7146/math.scand.a-12123. Disponível em: https://www.mscand.dk/article/view/12123. Acesso em: 28 apr. 2024.