@article{10_21136_CMJ_1989_102296,
     author = {Ohriska, J\'an},
     title = {Oscillatory and asymptotic properties of third and fourth order linear differential equations},
     journal = {Czechoslovak Mathematical Journal},
     pages = {215--224},
     publisher = {mathdoc},
     volume = {39},
     number = {2},
     year = {1989},
     doi = {10.21136/CMJ.1989.102296},
     mrnumber = {992128},
     zbl = {0688.34018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1989.102296/}
}