BJÖRN, Jana. Regularity at infinity for a mixed problem for degenerate elliptic operators in a half-cylinder. Mathematica Scandinavica, Berkeley, CA, United States, v. 81, p. 101–126, 1997. DOI: 10.7146/math.scand.a-12868. Disponível em: https://journals.msp.org/mscand/article/view/1036. Acesso em: 25 jul. 2026.