GARDING, Lars. Dirichlet’s problem for linear elliptic partial differential equations. MATHEMATICA SCANDINAVICA, [S. l.], v. 1, p. 55–72, 1953. DOI: 10.7146/math.scand.a-10364. Disponível em: https://tidsskrift.dk/math/article/view/10364. Acesso em: 14 aug. 2026.