@article{MASLO_1978__28_4_a0,
     author = {Regenda, J\'an},
     title = {Oscillatory and nonoscillatory properties of solutions of the differential equation $y^{(4)}+P(t)y"+Q(t)y=0$},
     journal = {Mathematica slovaca},
     pages = {329--342},
     publisher = {mathdoc},
     volume = {28},
     number = {4},
     year = {1978},
     mrnumber = {534812},
     zbl = {0406.34041},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1978__28_4_a0/}
}