The monotonicity of extremants of integrals of the differential equation $y^{\text{'}\text{'}}+q\left(t\right)y=0$

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1. Hartman Philip, On Differential Equations and the Functions $J_{\mu }^2+Y_{\mu }^2$, (Amer. Journ. of Math. Vol. 83, 1961, str. 154-187) (1961) MR0123039
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