@article{AUPO_2002__41_1_a6,
     author = {Do\v{s}l\'y, Ond\v{r}ej},
     title = {Oscillatory properties of fourth order {Sturm-Liouville} differential equations},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {55--65},
     publisher = {mathdoc},
     volume = {41},
     number = {1},
     year = {2002},
     mrnumber = {1967340},
     zbl = {1055.34065},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_2002__41_1_a6/}
}