@article{ASNSP_2012_5_11_4_729_0,
     author = {Mugnai, Dimitri and Papageorgiou, Nikolaos S.},
     title = {Resonant nonlinear {Neumann} problems with indefinite weight},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {729--788},
     publisher = {Scuola Normale Superiore, Pisa},
     volume = {Ser. 5, 11},
     number = {4},
     year = {2012},
     mrnumber = {3060699},
     zbl = {1270.35215},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_2012_5_11_4_729_0/}
}