@article{120123, author = {Vladim\'\i r Vl\v cek}, title = {The first conjugate point of solution of the $N$-th order iterated differential equation}, journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica}, volume = {21}, year = {1982}, pages = {87-112}, zbl = {0522.34029}, mrnumber = {0702611}, language = {en}, url = {http://dml.mathdoc.fr/item/120123} }
Vlček, Vladimír. The first conjugate point of solution of the $N$-th order iterated differential equation. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 21 (1982) pp. 87-112. http://gdmltest.u-ga.fr/item/120123/
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