@article{JRAM_1984__348_152616,
     author = {Dietmar Kr\"oner},
     title = {Parabolic regularization and behaviour of the free boundary for unsaturated flow in a porous medium.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {180--196},
     publisher = {mathdoc},
     volume = {348},
     year = {1984},
     zbl = {0517.76095},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1984__348_152616/}
}