FUGLEDE, Bent. The Symmetric Normal Derivative of a Subharmonic Function II. MATHEMATICA SCANDINAVICA, [S. l.], v. 12, p. 129–146, 1963. DOI: 10.7146/math.scand.a-10677. Disponível em: https://tidsskrift.dk/math/article/view/10677. Acesso em: 14 aug. 2026.