MEJLBRO, Leif; TOPSOE, Flemming. Vitali Systems in $\mathsf{R}^n$ with Irregular Sets. Mathematica Scandinavica, Berkeley, CA, United States, v. 79, p. 86–100, 1996. DOI: 10.7146/math.scand.a-12594. Disponível em: https://journals.msp.org/mscand/article/view/1079. Acesso em: 25 jul. 2026.