@article{EJDE_2003__2003__a193,
     author = {Carmona,  Jos\'e and Cingolani,  Silvia and Vannella,  Giuseppina},
     title = {Estimates for critical groups of solutions to quasilinear elliptic systems},
     journal = {Electronic journal of differential equations},
     year = {2003},
     volume = {2003},
     zbl = {1040.58006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2003__2003__a193/}
}