@article{120127, author = {Vladim\'\i r Vl\v cek}, title = {Conjugate points of solutions of an iterated differential equation of the $n$-th order}, journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica}, volume = {22}, year = {1983}, pages = {115-130}, zbl = {0545.34025}, mrnumber = {744706}, language = {en}, url = {http://dml.mathdoc.fr/item/120127} }
Vlček, Vladimír. Conjugate points of solutions of an iterated differential equation of the $n$-th order. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 22 (1983) pp. 115-130. http://gdmltest.u-ga.fr/item/120127/
The first conjugate point of solution of the N-th order iterated differential equation;, Acta UP Olom., F. R. N., Tom 73, 1982. (1982) | MR 0702611 | Zbl 0522.34029
Lineare Differentialtransformationen 2. Ordnung;, VEB Deutscher Verlag der Wissenschaften, Berlin, 1967. (1967) | MR 0236448
Properties of solutions of Nth order linear differential equations;, Pacific J. Math., Vol. 15, No. 3, 1965. (1965) | MR 0185185 | Zbl 0132.31204
Conjugate points of solutions of a fourth-order iterated linear differential equation;, Acta UP Olom., F. R. N., Tom 53, 1977. (1977) | MR 0594951
On a distribution of zeros of solutions of a fourth-order iterated linear differential equation;, Acta UP Olom., F. R. N., Tom 57, 1978. (1978) | MR 0554040