@article{ARM_1978_14_3_a5,
     author = {Ol\'ah, Rudolf},
     title = {Note on the oscillatory behavior of bounded solutions of higher order differential equation with retarded argument},
     journal = {Archivum mathematicum},
     pages = {171--174},
     year = {1978},
     volume = {14},
     number = {3},
     mrnumber = {512756},
     zbl = {0399.34063},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1978_14_3_a5/}
}