Monotonicity theorems concerning differential equations $y^{\text{'}\text{'}}+f(t,y,y^{\text{'}})=0$

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1. M. Бapтушeк, O нyляx кoлeблющuxcя peшeнuй ypaвнeнuя ${\left(p\left(t\right)x^{\text{'}}\right)}^{\text{'}}+f(t,x,x^{\text{'}})=0$, Дифф. уpaв. XII, No 4, 621-625. 
2. M. Bartušek, On Zeros of Solutions of the Differential Equation ${\left(p\left(t\right)y^{\text{'}}\right)}^{\text{'}}+f(t,y,y^{\text{'}})=0$, Arch. Math. XI, No 4, 187-192. Zbl0342.34018MR0409975
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4. K. M. Das, Comparison and Monotonity Theorems for Second Order Non-linear Differential Equations, Acta Math. Acad. Sci. Hung., 15, No 3-4, 1964, 449-456. (1964) Zbl0135.14102MR0176155
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7. A. Г. Kaтpaнoв, Oб acuмnmomuчecкoм noвeдeнuu кoлeблющuxcя peшeнuй ypaвнeнuя $\ddot{x}+f(t,x)g\left(\dot{x}\right)=0$, Дифф. уpaвнeния, VIII, No 6, 1972, 1111-1115. (1972) 

1. Miroslav Bartušek, On zeros of solutions of the differential equation $y^{\text{'}\text{'}}+f(t,y)g\left(y^{\text{'}}\right)=0$
2. Miroslav Bartušek, Monotonicity theorems for second order non-linear differential equations
3. Miroslav Bartušek, Chrysi G. Kokologiannaki, Monotonicity properties of oscillatory solutions of differential equation $\left(a\left(t\right)\right|y^{\text{'}}{{|}^{p-1}{y}^{\text{'}})}^{\text{'}}+f(t,y,y^{\text{'}})=0$
4. Miroslav Bartušek, On asymptotic properties and distribution of zeros of solutions of $y^{\text{'}\text{'}}+f(t,y,y^{\text{'}})=0$