WANBY, G. Subharmonic and Strongly Subharmonic Functions in Case of Variable Coefficients. MATHEMATICA SCANDINAVICA, [S. l.], v. 22, p. 283–309, 1968. DOI: 10.7146/math.scand.a-10892. Disponível em: https://www.mscand.dk/article/view/10892. Acesso em: 3 may. 2024.