@article{GDZPPN002196778,
title = {On boundary Harnack principles and poles of extremal harmonic functions.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {310},
year = {1979},
pages = {384-388},
zbl = {0409.31009},
url = {http://dml.mathdoc.fr/item/GDZPPN002196778}
}
Hueber, H. On boundary Harnack principles and poles of extremal harmonic functions.. Journal für die reine und angewandte Mathematik, Tome 310 (1979) pp. 384-388. http://gdmltest.u-ga.fr/item/GDZPPN002196778/