HANSSON, K. Imbedding theorems of Sobolev type in potential theory. MATHEMATICA SCANDINAVICA, [S. l.], v. 45, p. 77–102, 1979. DOI: 10.7146/math.scand.a-11827. Disponível em: https://www.mscand.dk/article/view/11827. Acesso em: 3 may. 2024.