@article{CMUC_1977__18_4_a8,
     author = {Fu\v{c}{\'\i}k, Svatopluk},
     title = {Nonlinear equations with linear part at resonance: {Variational} approach},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {723--734},
     publisher = {mathdoc},
     volume = {18},
     number = {4},
     year = {1977},
     mrnumber = {0500339},
     zbl = {0376.47030},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1977__18_4_a8/}
}