GAULD, D. B.; MARTIN, G. J. Essential singularities of quasimeromorphic mappings. Mathematica Scandinavica, Berkeley, CA, United States, v. 73, p. 36–40, 1993. DOI: 10.7146/math.scand.a-12454. Disponível em: https://journals.msp.org/mscand/article/view/1212. Acesso em: 24 jul. 2026.