HOFFMANN-JORGENSEN, Jorgen. Coverings of Metric Spaces with Randomly Placed Balls. Mathematica Scandinavica, Berkeley, CA, United States, v. 32, p. 169–186, 1973. DOI: 10.7146/math.scand.a-11453. Disponível em: https://journals.msp.org/mscand/article/view/2153. Acesso em: 25 jul. 2026.