HOPE, Rafael; KATCHALSKI, Meir. Separating plane convex sets. Mathematica Scandinavica, Berkeley, CA, United States, v. 66, p. 44–46, 1990. DOI: 10.7146/math.scand.a-12291. Disponível em: https://journals.msp.org/mscand/article/view/1333. Acesso em: 25 jul. 2026.