@article{CMUC_1983__24_2_a15,
     author = {Quittner, Pavol},
     title = {Singular sets and number of solutions of nonlinear boundary value problems},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {371--385},
     publisher = {mathdoc},
     volume = {24},
     number = {2},
     year = {1983},
     mrnumber = {711273},
     zbl = {0529.35027},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1983__24_2_a15/}
}