ISRAEL, R. B.; PHELPS, R. R. Some convexity questions arising in statistical mechanics. Mathematica Scandinavica, Berkeley, CA, United States, v. 54, p. 133–156, 1984. DOI: 10.7146/math.scand.a-12048. Disponível em: https://journals.msp.org/mscand/article/view/1577. Acesso em: 25 jul. 2026.