@article{AIHPC_1990__7_2_37_0,
     author = {Alvino, A. and Trombetti, G. and Lions, P.-L.},
     title = {Comparison results for elliptic and parabolic equations via {Schwarz} symmetrization},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {37--65},
     publisher = {Gauthier-Villars},
     volume = {7},
     number = {2},
     year = {1990},
     mrnumber = {1051227},
     zbl = {0703.35007},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1990__7_2_37_0/}
}