@article{COCV_2006__12_3_398_0,
     author = {L\'opez, Gin\'es and Montero-S\'anchez, Juan-Aurelio},
     title = {Neumann boundary value problems across resonance},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {398--408},
     publisher = {EDP-Sciences},
     volume = {12},
     number = {3},
     year = {2006},
     doi = {10.1051/cocv:2006009},
     mrnumber = {2224820},
     zbl = {1123.34011},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/cocv:2006009/}
}