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References:
[1] Vlček V.: Conjugate points of solutions of an iterated differential equation of the N-th order. Acta UP Olom., F. R. N., Tom 76, 1983. MR 0744706 | Zbl 0545.34025
[2] Borůvka O.: Lineare Differentialtransformationen 2. Ordnung. VEB Deutscher Verlag der Wissenschaften, Berlin, 1967. MR 0236448
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