GUDMUNDSSON, Sigmundur; WOOD, John C. Multivalued harmonic morphisms. MATHEMATICA SCANDINAVICA, [S. l.], v. 73, p. 127–155, 1993. DOI: 10.7146/math.scand.a-12460. Disponível em: https://www.mscand.dk/article/view/12460. Acesso em: 5 dec. 2025.