GUSTAVSSON, Jan. A function parameter in connection with interpolation of Banach spaces. Mathematica Scandinavica, Berkeley, CA, United States, v. 42, p. 289–305, 1978. DOI: 10.7146/math.scand.a-11754. Disponível em: https://journals.msp.org/mscand/article/view/1891. Acesso em: 25 jul. 2026.