ARKERYD, Leif. On the $L^p$ Estimates for Elliptic Boundary Problems. Mathematica Scandinavica, Berkeley, CA, United States, v. 19, p. 59–76, 1966. DOI: 10.7146/math.scand.a-10796. Disponível em: https://journals.msp.org/mscand/article/view/2545. Acesso em: 25 jul. 2026.