@article{PORMA_1982__41_1-4_115506,
     author = {V\'azquez, Juan L.},
     title = {Symmetrization in nonlinear parabolic equations},
     journal = {Portugaliae mathematica},
     pages = {339--346},
     publisher = {mathdoc},
     volume = {41},
     number = {1-4},
     year = {1982},
     mrnumber = {0766862},
     zbl = {0524.35061},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1982__41_1-4_115506/}
}