BRIEM, E. Conditional Banach Spaces, Conditional Projections and Generalized Martingales. MATHEMATICA SCANDINAVICA, [S. l.], v. 27, p. 227–236, 1970. DOI: 10.7146/math.scand.a-11001. Disponível em: https://www.mscand.dk/article/view/11001. Acesso em: 2 may. 2024.