TOPSOE, F. Measure Spaces Connected by Correspondences. MATHEMATICA SCANDINAVICA, [S. l.], v. 30, p. 5–45, 1972. DOI: 10.7146/math.scand.a-11061. Disponível em: https://www.mscand.dk/article/view/11061. Acesso em: 7 may. 2024.