BRONDSTED, A. Convex Sets and Chebyshev Sets II. MATHEMATICA SCANDINAVICA, [S. l.], v. 18, p. 5–15, 1966. DOI: 10.7146/math.scand.a-10773. Disponível em: https://www.mscand.dk/article/view/10773. Acesso em: 8 may. 2024.