MARTIO, O. On the Integrability of the Derivative of a Quasiregular Mapping. MATHEMATICA SCANDINAVICA, [S. l.], v. 35, p. 43–48, 1974. DOI: 10.7146/math.scand.a-11534. Disponível em: https://www.mscand.dk/article/view/11534. Acesso em: 4 may. 2024.