HOFFMANN-JORGENSEN, J. Weak Compactness and Tightness of Subsets of $M(X)$. Mathematica Scandinavica, Berkeley, CA, United States, v. 31, p. 127–150, 1972. DOI: 10.7146/math.scand.a-11420. Disponível em: https://journals.msp.org/mscand/article/view/2225. Acesso em: 25 jul. 2026.