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References:
[1] Borůvka O.: Linear Differentialtransformationen 2. Ordnung. VEB, Berlin 1967.
[2] Neuman F.: Extremal Property of the Equation $y" =-k^2 y$. Archivum Mathematicum (Brno), T. 8 (1907), 161-164. MR 0236465
[3] Neuman F.: Construction of Differential Equations with Coexisting Periodic Solutions. to appear in Bul. Inst. Polit. din Jaşi. MR 0283305 | Zbl 0267.34039
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