@article{RLIN_1993_9_4_4_a1,
     author = {Carminati, Carlo},
     title = {Some perturbation results for non-linear problems},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni},
     pages = {243--250},
     publisher = {mathdoc},
     volume = {Ser. 9, 4},
     number = {4},
     year = {1993},
     zbl = {0799.58063},
     mrnumber = {113234},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RLIN_1993_9_4_4_a1/}
}