CECCHINI, C. An abstract characterization of $\omega$-conditional expectations. MATHEMATICA SCANDINAVICA, [S. l.], v. 66, p. 155–160, 1990. DOI: 10.7146/math.scand.a-12300. Disponível em: https://www.mscand.dk/article/view/12300. Acesso em: 29 apr. 2024.