@article{MAN_1981__257_163573,
     author = {W. Hansen},
     title = {Semi-Polar {Sets} and {Quasi-Balayage.}},
     journal = {Mathematische Annalen},
     pages = {495--517},
     publisher = {mathdoc},
     volume = {257},
     year = {1981},
     zbl = {0458.31008},
     url = {http://geodesic.mathdoc.fr/item/MAN_1981__257_163573/}
}