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References:
[1] Sherman T. L.: Properties of solutions of $N^{\text th}$ order linear differential equations. Pacific J. Math, Vol. 15, No. 3, 1965 MR 0185185
[2] Borůvka O.: Lineare Differentialtransformationen 2. Ordnung. VEB Deutscher Verlag der Wissenschaften, Berlin, 1967 MR 0236448 | Zbl 0153.11201
[3] Vlček V.: On a distribution of zeros of solutions of a fourth-order iterated linear differential equation. Acta UP Olom., F. R. N., Tom 57, 1978 MR 0554040 | Zbl 0422.34037
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