Monotonicity theorems for second order non-linear differential equations

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1. M. Бapтyшек, O нyляx кoлеблющиxcя pешений ypaвнения ${\left(p\left(x\right)x^{\text{'}}\right)}^{\text{'}}+f(t,x,x^{\text{'}})=0$, Дифф. ypaв., XII, Но. 24, 621-625. 
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1. Miroslav Bartušek, Chrysi G. Kokologiannaki, Monotonicity properties of oscillatory solutions of differential equation $\left(a\left(t\right)\right|y^{\text{'}}{{|}^{p-1}{y}^{\text{'}})}^{\text{'}}+f(t,y,y^{\text{'}})=0$