BRIEM, Eggert. Conditional Banach Spaces, Conditional Projections and Generalized Martingales. Mathematica Scandinavica, Berkeley, CA, United States, v. 27, p. 227–236, 1970. DOI: 10.7146/math.scand.a-11001. Disponível em: https://journals.msp.org/mscand/article/view/2326. Acesso em: 25 jul. 2026.