@article{AUPO_1983__22_1_a11,
     author = {Vl\v{c}ek, Vladim{\'\i}r},
     title = {Conjugate points of solutions of an iterated differential equation of the $n$-th order},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {115--130},
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {1983},
     mrnumber = {744706},
     zbl = {0545.34025},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1983__22_1_a11/}
}