TVERBERG, Helge. A seperation property of plane convex sets. MATHEMATICA SCANDINAVICA, [S. l.], v. 45, p. 255–260, 1979. DOI: 10.7146/math.scand.a-11840. Disponível em: https://tidsskrift.dk/math/article/view/11840. Acesso em: 13 aug. 2026.