@article{EJDE_2007__2007__a238,
     author = {Crescimbeni,  Raquel and Forzani,  Liliana and Perini,  Alejandra},
     title = {A new proof of {Harnack's} inequality for elliptic partial differential equations in divergence form},
     journal = {Electronic journal of differential equations},
     year = {2007},
     volume = {2007},
     zbl = {1162.35332},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2007__2007__a238/}
}