@article{DMDICO_2001_21_2_a2,
     author = {Fiacca, Antonella and Servadei, Raffaella},
     title = {Extremal solutions for nonlinear neumann problems},
     journal = {Discussiones Mathematicae. Differential Inclusions, Control and Optimization},
     pages = {191--206},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {2001},
     zbl = {1013.35035},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMDICO_2001_21_2_a2/}
}