BACKLUND, Ulf; PERSSON, Leif. Seperable maximal pluriharmonic functions in two complex variables. Mathematica Scandinavica, Berkeley, CA, United States, v. 81, p. 260–268, 1997. DOI: 10.7146/math.scand.a-12879. Disponível em: https://journals.msp.org/mscand/article/view/1025. Acesso em: 24 jul. 2026.