@article{EJDE_2000__2000__a141,
     author = {Ko, Youngsang},
     title = {Regularity of the interface for the porous medium equation},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2000},
     year = {2000},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2000__2000__a141/}
}