@article{CMJ_2003_53_2_a19,
     author = {Palumb{\'\i}ny, Oleg},
     title = {On oscillation criteria of fourth order linear differential equations},
     journal = {Czechoslovak Mathematical Journal},
     pages = {467--477},
     year = {2003},
     volume = {53},
     number = {2},
     mrnumber = {1983466},
     zbl = {1036.34038},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2003_53_2_a19/}
}