@article{JRAM_1988__387_153026,
     author = {Rainer Wittmann},
     title = {A uniform boundary {Harnack} inequality on non-tangentially accessible domains.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {69--96},
     publisher = {mathdoc},
     volume = {387},
     year = {1988},
     zbl = {0644.31011},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1988__387_153026/}
}