@article{AUPO_1978__17_1_a9,
     author = {Vl\v{c}ek, Vladim{\'\i}r},
     title = {On a distribution of zeros of solutions of a fourth-order iterated linear differential equation},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {85--108},
     publisher = {mathdoc},
     volume = {17},
     number = {1},
     year = {1978},
     mrnumber = {0554040},
     zbl = {0422.34037},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1978__17_1_a9/}
}