@article{AUPO_1980__19_1_a1,
     author = {Vl\v{c}ek, Vladim{\'\i}r},
     title = {On transformations of bundles of solutions of a fourth order iterated linear differential equation},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {23--38},
     publisher = {mathdoc},
     volume = {19},
     number = {1},
     year = {1980},
     mrnumber = {0630366},
     zbl = {0483.34031},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1980__19_1_a1/}
}