TOPSOE, Flemming. Measure Spaces Connected by Correspondences. Mathematica Scandinavica, Berkeley, CA, United States, v. 30, p. 5–45, 1972. DOI: 10.7146/math.scand.a-11061. Disponível em: https://journals.msp.org/mscand/article/view/2264. Acesso em: 25 jul. 2026.