@article{articleb605e99b,
title   = {On the regularity up to the boundary in the Dirichlet problem for degenerate elliptic equations},
author = {Bergamasco, Adalberto Panobianco and Gerszonowicz, Jorge A and Petronilho, Gerson},
year = {1989},
doi = {10.1090/s0002-9947-1989-0929659-7},
journal   = {Transactions of the American Mathematical Society}
}