@article{MASLO_1983_33_4_a6,
     author = {Rovder, Jozef},
     title = {Oscillatory properties of the fourth order linear differential equation},
     journal = {Mathematica slovaca},
     pages = {371--379},
     year = {1983},
     volume = {33},
     number = {4},
     mrnumber = {720507},
     zbl = {0525.34027},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1983_33_4_a6/}
}