@article{EJDE_2000__2000__a15,
     author = {Ragoub,  L.},
     title = {Symmetry theorems via the continuous {Steiner} symmetrization},
     journal = {Electronic journal of differential equations},
     year = {2000},
     volume = {2000},
     zbl = {1003.35026},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2000__2000__a15/}
}