FORNAESS, John Erik. The Levi problem in Stein spaces. Mathematica Scandinavica, Berkeley, CA, United States, v. 45, p. 55–69, 1979. DOI: 10.7146/math.scand.a-11825. Disponível em: https://journals.msp.org/mscand/article/view/1820. Acesso em: 25 jul. 2026.