TVERBERG, Helge. A seperation property of plane convex sets. Mathematica Scandinavica, Berkeley, CA, United States, v. 45, p. 255–260, 1979. DOI: 10.7146/math.scand.a-11840. Disponível em: https://journals.msp.org/mscand/article/view/1807. Acesso em: 25 jul. 2026.