@article{AUPO_1979__18_1_a10,
     author = {Vl\v{c}ek, Vladim{\'\i}r},
     title = {On functions describing a distribution of zeros of solutions of an iterated linear differential equation of the fourth order},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {103--116},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {1979},
     mrnumber = {0589852},
     zbl = {0452.34028},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1979__18_1_a10/}
}