HEDBERG, Torbjörn. A Phragmén-Lindelöf Type Theorem for a Certain Class of Generalized Subharmonic Functions. Mathematica Scandinavica, Berkeley, CA, United States, v. 28, p. 202–206, 1971. DOI: 10.7146/math.scand.a-11016. Disponível em: https://journals.msp.org/mscand/article/view/2280. Acesso em: 25 jul. 2026.