ANDERSEN, T. B.; POULSEN, E. T. On Semi-Extremal Subsets of Convex Sets. MATHEMATICA SCANDINAVICA, [S. l.], v. 23, p. 167–168, 1968. DOI: 10.7146/math.scand.a-10906. Disponível em: https://www.mscand.dk/article/view/10906. Acesso em: 29 apr. 2024.