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Some properties of solutions of $$u''+a(t)f(u) = 0$$. (English) Zbl 0116.29401

##### Keywords:
ordinary differential equations
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##### References:
 [1] R. Bellman, Stability Theory of Differential Equations, New York, 1953. · Zbl 0053.24705 [2] W. R. Utz, Properties of Solutions ofu?+g(t)u 2n?1=0. Monatshefte für Mathematik, 66 (1962), pp 55-60. · Zbl 0101.30603 · doi:10.1007/BF01418878
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