@article{AUPO_1982__21_1_a8,
     author = {Vl\v{c}ek, Vladim{\'\i}r},
     title = {The first conjugate point of solution of the $N$-th order iterated differential equation},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {87--112},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {1982},
     mrnumber = {0702611},
     zbl = {0522.34029},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1982__21_1_a8/}
}