Oscillation criteria for fourth-order linear differential equations

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1. Ján Regenda, Oscillation theorems for a class of linear fourth order differential equations
2. Ján Regenda, A note on oscillation and nonoscillation criteria for fourth order linear differential equations
3. Ján Regenda, Oscillation criteria for differential equation $y^{\left(4\right)}+P\left(t\right)y^{\text{'}\text{'}}+R\left(t\right)y^{\text{'}}+Q\left(t\right)y=0$
4. Oleg Palumbíny, On oscillation criteria of fourth order linear differential equations
5. Oleg Palumbíny, On oscillatory solutions of fourth order ordinary differential equations