@article{CMJ_1999_49_4_a8,
     author = {Palumb{\'\i}ny, Oleg},
     title = {On oscillatory solutions of fourth order ordinary differential equations},
     journal = {Czechoslovak Mathematical Journal},
     pages = {779--790},
     year = {1999},
     volume = {49},
     number = {4},
     mrnumber = {1746703},
     zbl = {1015.34018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_1999_49_4_a8/}
}