@article{EJDE_2002__2002__a50,
     author = {Do\v{s}l\'y,  Ond\v{r}ej},
     title = {Constants in the oscillation theory of higher order {Sturm-Liouville} differential equations},
     journal = {Electronic journal of differential equations},
     year = {2002},
     volume = {2002},
     zbl = {1016.34029},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2002__2002__a50/}
}