DAHLBERG, Björn E. J. On the radial boundary values of subharmonic functions. Mathematica Scandinavica, Berkeley, CA, United States, v. 40, p. 301–317, 1977. DOI: 10.7146/math.scand.a-11697. Disponível em: https://journals.msp.org/mscand/article/view/1949. Acesso em: 25 jul. 2026.