@article{JRAM_1990__409_153255,
     author = {W. Hansen and I. Netuka},
     title = {Regularizing sets of irregular points.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {205--218},
     publisher = {mathdoc},
     volume = {409},
     year = {1990},
     zbl = {0701.31007},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1990__409_153255/}
}