@article{ARM_1997__33_4_a7,
     author = {Stan\v{e}k, Svatoslav},
     title = {On a criterion for the existence of at least four solutions of functional boundary value problems},
     journal = {Archivum mathematicum},
     pages = {335--348},
     publisher = {mathdoc},
     volume = {33},
     number = {4},
     year = {1997},
     mrnumber = {1601341},
     zbl = {0914.34063},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1997__33_4_a7/}
}