@article{CMUC_1998__39_4_a6,
     author = {Fe\v{c}kan, Michal},
     title = {Existence of nonzero nonnegative solutions of semilinear equations at resonance},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {709--719},
     publisher = {mathdoc},
     volume = {39},
     number = {4},
     year = {1998},
     mrnumber = {1715460},
     zbl = {1060.47510},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1998__39_4_a6/}
}