GARDINER, Stephen J. Maximum principles for subharmonic functions. MATHEMATICA SCANDINAVICA, [S. l.], v. 68, p. 210–220, 1991. DOI: 10.7146/math.scand.a-12358. Disponível em: https://tidsskrift.dk/math/article/view/12358. Acesso em: 13 aug. 2026.